Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6a4fbcba3de784…

MALICIOUS

PDF

87.2 KB Created: 2021-06-13 05:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dc435aed3c0261b6ef0903885855a167 SHA-1: b100585555c767e20e592d0ab56ab69017cd72f5 SHA-256: 2a6a4fbcba3de78430e0e3978cfe2806be136bd1277a131a4f30f2b6f810745f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a critical ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95) and an ML classifier, indicating malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this. No scripts were extracted, but the overall structure and heuristics point to a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://nomylo.ru/pbw?utm_term=ventress+dark+disciple PDF link annotation
    • https://bazeliwelari.weebly.com/uploads/1/3/1/8/131857734/pisipibep.pdfIn PDF document text
    • https://gajebafanagifim.weebly.com/uploads/1/3/2/8/132815836/dibuzegadanixiz.pdfIn PDF document text
    • https://kulitexujaw.weebly.com/uploads/1/3/4/0/134099612/1087281.pdfIn PDF document text
    • https://tejisapaw.weebly.com/uploads/1/3/1/1/131163851/fubazesixebuzuwox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_6060cea72ee40.pdfIn PDF document text
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/2270268.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/tudeta_lujujidotez_febobosobilal_jekulod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450041/normal_60480adc38fc6.pdfIn PDF document text
    • https://tukajolikapuz.weebly.com/uploads/1/3/5/3/135346043/d6b1f3c29f2.pdfIn PDF document text
    • https://dedofuzogod.weebly.com/uploads/1/3/4/3/134374436/mobebevemojit-silikitoj-dagozaz.pdfIn PDF document text
    • https://gofezirorelude.weebly.com/uploads/1/3/4/4/134486205/bomofixiviwizowuti.pdfIn PDF document text
    • https://mebawepuxir.weebly.com/uploads/1/3/4/5/134525212/45852d7b8d.pdfIn PDF document text
    • https://wuvatefowid.weebly.com/uploads/1/3/4/4/134470889/5ef13ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/56867418-ee81-461a-9f4b-23634d883b3d/sunquest_pro_24rs_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8c376f-4760-49ef-adeb-29a6dbc7f69d/42751624937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8bd5dc-7a5a-4edc-a1f5-afcdd1ee27b0/was_jessie_in_the_original_ff7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdbeea4a-c291-40a3-ae5a-34efd7a98122/bent_brake_dust_shield_noise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229c28bd-d970-4b2d-a11a-6d6a861bc5fe/how_long_do_snow_blower_batteries_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e46377-1ce1-45ae-be18-8c34816bbf10/ejemplos_de_dialogos_directos_con_guion_largo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92fd463f-da8d-444d-bcc7-2fb1cf968aba/navy_advancement_quotas_2020_active_duty_fall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbcecf21-4763-4d2d-98ca-b4b14756bf5e/9194856190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d87a2112-2d95-4584-98a1-4b4a684b05e3/71721141087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1c7232-684b-4b46-ae3c-022247a6da12/samsung_blu-ray_player_keeps_flashing_on_and_off.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 5096 bytes
SHA-256: 1a48dda495bd076e1a182ba06975d58e9a3ac6f4fea2e931ddd5878c2dd65b68
font_01_sfnt_off0001283a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 11736 bytes
SHA-256: 2c3907e8bff78a3fc77827df19c5d3cab0ddf1d8acdc63e68989dba810db489e

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