Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ccf49d473136d6…

MALICIOUS

PDF

99.4 KB Created: 2021-05-31 09:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1ba7a1102a48ef1a6c774eb8f2524cd7 SHA-1: b0c8df0932bab8b76f94a0bd49209276cf2af351 SHA-256: b5ccf49d473136d67ef46068c2e19c1fd6501ba0c063e8085fa70e5e6605c5bb
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the structure and heuristics point towards a malicious PDF, potentially using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://static.s123-cdn-static.com/uploads/4380876/normal_5fc7009a21036.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_6012fc29ce1fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_605ab132b8f66.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/5f156a4fdac377a.pdfIn PDF document text
    • https://zukifetev.weebly.com/uploads/1/3/4/7/134725253/sadogifuzonaluxara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475852/normal_604472c60b43b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451949/normal_60353931b85c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_60312e60cad66.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465935/normal_60b31ab88ae3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415768/normal_606447fb95983.pdfIn PDF document text
    • https://vajawopi.weebly.com/uploads/1/3/4/5/134597817/vumofabajud.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4485689/normal_60b244b0172e3.pdfIn PDF document text
    • https://vapevaka.weebly.com/uploads/1/3/1/4/131407737/kiboge_zopagazapefewo_bijosevowarow_lunafagijuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_606e570b534e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dRGGkpkNhSI/wb?keyword=3d%20warehouse%20sketchup%202018%20n%C3%A3o%20funcionaPDF link annotation
    • https://uploads.strikinglycdn.com/files/886a1115-1627-4720-b701-8c2f6a5891c5/escape_from_alcatraz_tamil_dubbed_movie_download_in_isaimini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec83db19-289b-4fa7-958b-0044e2c10f65/62055509986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22355a7b-3312-477c-91f2-f1ff2da42925/how_to_connect_my_dell_wireless_mouse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3231abf1-b4c2-4a37-97bf-a0d82ef73f48/how_to_change_light_switch_on_harbor_breeze_ceiling_fan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb737a4-5583-4db0-a10f-6218640df111/tapilaxuxovixeronurogimos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fabcb139-6b36-45f7-8fbb-a0f0591df2cb/11305580709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df42daf8-e7f2-4917-a6ca-0f3ff3f03497/ritoriziwizuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0ccbc5-b5b4-4e1e-98e8-948da168839c/los_censores_luisa_valenzuela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc83731-6b10-4c2c-a71f-861daada20db/paxekejutuguwezidopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1cef99-d00c-4ed4-8b8e-26b40a69332b/pupujabutabop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22de98ac-de86-4412-b3ea-d48ee172caa8/diruzanasukapixevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf6a5d8-a503-4709-a39f-f208b9c3574c/47556292021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b23a45-ebfc-47f4-9ece-0e6b00274c28/ingersoll_rand_air_compressor_t30_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4f8129-5934-422d-8e16-e409e427fdf4/bolidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2fef745-f93c-451b-97b7-66f454f745e1/36861421509.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001267f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267F 3624 bytes
SHA-256: 0f88c7ef5d554afd1eb69920755fbfb3e15cddd0cb97ded6a1c61602fc22641a
font_01_sfnt_off0001334c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 6272 bytes
SHA-256: 3836904eccbf756b0b2a840bb62e52a200917f29bc86a426eeced05647476cf8
font_02_sfnt_off0001481a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481A 2052 bytes
SHA-256: bfc0904f0f0d07b2dad5b874710802535660feb5301dd45df0a8c923e4b19bcb
font_03_sfnt_off000150d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D0 14336 bytes
SHA-256: 7caab0e1e1fa391842f228557e9e2c5534fbe3aedf35db5c13dd76544b509e38

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