Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56caf0f5ca5dba3…

MALICIOUS

PDF

79.2 KB Created: 2021-03-10 14:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 184eed3625f5542decff88dbd85b68e8 SHA-1: bfe9968e3cdc1e0642867f6e74fa62a8e654b0b3 SHA-256: b56caf0f5ca5dba3eebfaf414fdcdca840e2f989f05b74d3b29a5f8631586bab
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/award?keyword=agenda+digital+2020+pdf PDF link annotation
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/vixekoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_600b388cbf31c.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/wKyidfT/25410974657.pdfIn PDF document text
    • https://gatakuluva.weebly.com/uploads/1/3/1/8/131856326/2957829.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/dUejgem/zombie_monster_truck_game_unblocked.pdfIn PDF document text
    • https://nanupiwe.weebly.com/uploads/1/3/1/6/131606486/xilutikaku-kinapiw-darigifon-bumawanepixebam.pdfIn PDF document text
    • https://cdn.sqhk.co/riwoxedaki/K00jcii/funolowisar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_60364f8c12f64.pdfIn PDF document text
    • https://cdn.sqhk.co/tuminageka/ggCevgg/13671318293.pdfIn PDF document text
    • https://furikokazi.weebly.com/uploads/1/3/5/3/135399827/zijirutenefavit.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/ja0GjfK/kamatapisejojuzudi.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/gakazefezu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_5dc9397ad5cc4593a459114b11a6b951.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_da5a5fc8f9e54b64aceb5525bf391062.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_b0294e7535634c90b41544a56f5490f6.pdf?index=trueIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_ecbddff08d2542f4896fd3078d2cd161.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fapaga/lbd_online_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/hum_alt_balaji_episode_13.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_74c4f611086c48ea9b03dcae8065fc0f.pdf?index=trueIn PDF document text
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_ce901e717c0a4a4984f02ed54b6a915d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fopalew/arveloven_2008_retsinformation.pdfIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_5ea4aa07780942e88f673fcbeb087789.pdf?index=trueIn 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_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 5200 bytes
SHA-256: 19ca9f423be86f690fb65ec287d2a10d7222350817ca53de0c8f699f9c698b68
font_01_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 10468 bytes
SHA-256: 9059f8af7cf1ad451b4160626fecf2e41f20337b1a282b831f07be2eb02c2e89