Malicious PDF — malware analysis report

Static analysis result for SHA-256 8667c53f102f595a…

MALICIOUS

PDF

81.2 KB Created: 2021-05-29 03:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c99558a35c426ef6e98d4603a42813b0 SHA-1: 45e86d0ca7c83ebe6a3645cf2c5e18cd5d743562 SHA-256: 8667c53f102f595ae3ecd54feb0e4ad989b3e65f80330f1414cf15038cd02bac
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/strik?utm_term=diffusion+osmosis+lab+dialysis+tubing+answers PDF link annotation
    • https://pifeposanitu.weebly.com/uploads/1/3/4/7/134753567/rodaditabuduzifano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_6067299ac8f4a.pdfIn PDF document text
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/wutugelijubesa_miledujuremap_sukavuze_mazewe.pdfIn PDF document text
    • https://gudagomafefaxer.weebly.com/uploads/1/3/4/5/134523608/98d29b08b06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_602b3f6f434a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5fd332d7147e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382782/normal_5feb32da444b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528876/normal_605138ab7f5f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491725/normal_5fe3d89c8488f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6026c25dc4091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412573/normal_5ffadd5a43f1d.pdfIn PDF document text
    • https://nuwudune.weebly.com/uploads/1/3/4/3/134362296/gixel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_602429b76ac36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453891/normal_5fcd36ab703ba.pdfIn PDF document text
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/fitiwuzizej-tekajedub.pdfIn PDF document text
    • https://zizobisorodevu.weebly.com/uploads/1/3/5/9/135964877/8539532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462985/normal_6057b28a42f01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_601e23189fa7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482849/normal_5fdaa98ce267f.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/b67b4955-eff2-47d2-9406-b7df9b44587d/my_passport_ultra_1tb_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0bfe348-e80d-4aaf-ae8e-8c42cb4631df/sowapilimadaponebulot.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_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 5560 bytes
SHA-256: 06b5c3b6b17cbe87cf64e028e6fa185b8e3cea395b4f803bc1bcd75a979d867b
font_01_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 10704 bytes
SHA-256: ee72683945dbb98b87931184394d08e4c27920d1f8d2bc5e1d2feacaf36923e6