Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4433fd8b35c4b2…

MALICIOUS

PDF

84.7 KB Created: 2021-06-03 15:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a75b1171467023844837ca4374b19a83 SHA-1: 52378deb60ce7497278851c8d0b6adcbb4e53b2f SHA-256: 0f4433fd8b35c4b27ccc30796a2a0fc9de2140f40643a001d6012aae20eb94b5
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://pistant.ru/pbw?utm_term=tabela+calorias+alimentos+completa+excel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489730/normal_603e2d9c0d856.pdfIn PDF document text
    • https://zavamemedu.weebly.com/uploads/1/3/4/3/134305249/vutaninoriputuniden.pdfIn PDF document text
    • https://vivesajepud.weebly.com/uploads/1/3/0/9/130969004/lisorafok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368956/normal_5fff6b3c8f5fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_60275a14a0b2b.pdfIn PDF document text
    • https://nenopejir.weebly.com/uploads/1/3/4/6/134603535/a45f2418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478383/normal_604997cf95443.pdfIn PDF document text
    • https://norokeveja.weebly.com/uploads/1/3/4/7/134706326/kabapiforuf-xunixezomif-rozon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_6015a584681fc.pdfIn PDF document text
    • https://jowapiwinutakun.weebly.com/uploads/1/3/4/3/134365581/rajoterag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5fcf9fb50c7c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_5fe68c5e2fe70.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4371005/normal_60b479e3dd4c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393508/normal_5fdfd2f282af4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5ff4fdf20604c.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/0f42131cab06.pdfIn PDF document text
    • https://nafufarub.weebly.com/uploads/1/3/4/2/134266214/fepiledaxapug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_5fd5f020687aa.pdfIn PDF document text
    • https://buwuxebukiz.weebly.com/uploads/1/3/1/6/131606134/6652085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pagorevet.pbworks.com/f/kivululo.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/kyambogo_university_private_admission_list_2020.pdfIn PDF document text
    • http://damopijos.pbworks.com/f/quadratic_equation_discriminant_worksheet.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_off00010989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 5236 bytes
SHA-256: fe1289daf6edda1f2b513b9ee8c814afd4bfd713514c2f1f876a55441411763a
font_01_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 13300 bytes
SHA-256: f50a0d942208551e8f11626843b5997aeb3fdc278d6e3c8b54fd1e592c621838