Malicious PDF — malware analysis report

Static analysis result for SHA-256 061f5ed508abe189…

MALICIOUS

PDF

69.8 KB Created: 2021-06-08 10:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 737032b9cfdd7d3f85e5684e4069efd0 SHA-1: 056d03af8da229242e64cb2f395f8c2379edcf71 SHA-256: 061f5ed508abe189925ff6b36e732580203d5dd9e0575d9d53ed9bdf7b1f1d30
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to disposable hosting services, likely for SEO manipulation or phishing. The presence of embedded URLs and the PDF structure suggest it is designed to redirect users to these malicious or deceptive sites.

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://medvor.ru/pbw?utm_term=is+sf2+nonpolar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491157/normal_6032a1068dbae.pdfIn PDF document text
    • https://kigimijufofudiv.weebly.com/uploads/1/3/5/9/135977026/sutix.pdfIn PDF document text
    • https://gelatotagubas.weebly.com/uploads/1/3/0/8/130813077/8551289.pdfIn PDF document text
    • https://lanekuloriko.weebly.com/uploads/1/3/0/8/130874063/41fdbe8c16.pdfIn PDF document text
    • https://kewusubeve.weebly.com/uploads/1/3/4/5/134515363/vesomibalenig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420767/normal_6067e58b64f35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370263/normal_5fcb48fa423bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446790/normal_604cfde45b63d.pdfIn PDF document text
    • https://zofiludel.weebly.com/uploads/1/3/5/3/135347527/ponusaboleko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491665/normal_600109205cbf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_6028948231093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_603b7afd29a90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_5fdc96bef27bd.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/5b5b7c7b-7347-4fbd-8261-9780a60ecce1/50187776863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e8f18d-01ee-44c5-9e2d-eb69fbb441a6/80611768634.pdfIn PDF document text
    • http://mosijiv.pbworks.com/w/file/fetch/144716628/28530970548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f1dd1f-7a66-4662-aca1-d0c1b57daad5/89790141065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d9b6ff-471b-4b66-96ea-7874c0a44cf0/gogovamotapekiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371af07a-c1a2-4ac4-82db-7c10cc310c65/balusazoxemofok.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144431568/case_in_point_complete_case_interview_preparation.pdfIn PDF document text
    • http://xawaren.pbworks.com/w/file/fetch/144418860/29496772171.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_off0000d47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47F 4964 bytes
SHA-256: 6e87e70595401b44c4d432139486fb26c2b224a0e7194db7517052f4c172b021
font_01_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 10872 bytes
SHA-256: 5e73fb5a341f762bb9f387651ca4329a8694728c817d8c62a25ac7e1b7dfd1ea