Malicious PDF — malware analysis report

Static analysis result for SHA-256 074d1bf47bd4d37d…

MALICIOUS

PDF

73.5 KB Created: 2021-04-30 16:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1f276e4c15c2afd741c9d97ce0d7c019 SHA-1: 30a6394db61db8b4bedb6e260c9f098a0ce7f565 SHA-256: 074d1bf47bd4d37de87c62e1be41e3c5b69a848eb1de0abaf44f1998b135eb15
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The embedded content, though heavily obfuscated, likely serves to disguise the true nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=vism+by+ncstar+vtaruvb+upper+receiver+vise+block+for+ar-15 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481665/normal_5ff396ca5ada5.pdfIn PDF document text
    • http://alexsaf.ru/drawing_software_for_windows_10_freelzt74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452593/normal_603526294b652.pdfIn PDF document text
    • https://cdn.sqhk.co/doxanusubomo/pzjgjje/fodavaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501503/normal_5ff4bd6ec66ef.pdfIn PDF document text
    • http://contarinihome.com/vewukibofaviwilojunubote34lkp.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/legepenafojinawulirotijimxdiv.pdfIn PDF document text
    • https://cdn.sqhk.co/tawavumazo/jhjjj44/monster_truck_destruction_pc_game.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/ALC5hcO/tewipafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_b6e06548d11a4ce8b4a43feb383b0d40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd94f0ee-3b98-4420-b781-b11264053031/reznor_unit_heater_parts_canada.pdfIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_f9288f0f2a9c42dc85ca4160e794a694.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_8b9040af77564f74b694c037797a77d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0aadb2-66df-4542-aa08-95dec4c390da/40617264703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19673811-f8df-42d6-b9c0-f27e31698d80/1782729757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d70a9b-c0bf-4daa-ba12-e171fb38d1a2/bogudovekud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29634032-72dd-441c-ba96-5fd2aae5c865/85418661416.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 5584 bytes
SHA-256: bf98187359ef42b99b4a4a832b2c936603ade0dd5c91d9d381959d7dd62256cf
font_01_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 9824 bytes
SHA-256: 5fe9e5db301738fa4c05ea4e595ce82c5c986a00b10a04d530f2089463d8056d
font_02_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361