Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5b3e8daf7c49be…

MALICIOUS

PDF

74.0 KB Created: 2021-06-12 16:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 742a04942b83696fdd9ddfd2b230a233 SHA-1: 09e79871f6a24500d10fb2e07df127141152c853 SHA-256: 8b5b3e8daf7c49be47b6f6dfafd9b5a70cc902854191ff8b443a7b2ce5e45f58
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/pbw?utm_term=novel+dilan+1991+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367617/normal_60b93470e8e16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417408/normal_5ffbd725bc7c4.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/7658947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415331/normal_5ffab1a2df023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500889/normal_60356968336b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_6066ad0cbedea.pdfIn PDF document text
    • https://nefotinabe.weebly.com/uploads/1/3/5/3/135314884/dabukanam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488566/normal_60264fe0603b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450731/normal_604d33a8edc4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452587/normal_5ff361839f4c0.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/mowamowekevawu_xefilawukex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500444/normal_6000edc62d248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406497/normal_5ffbb061577d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_6068865209e44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463791/normal_6017972767f94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5febb40c659d6.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/nijovobo.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
    • http://lopimexoxe.pbworks.com/w/file/fetch/145033980/three_branches_of_government_worksheet_free.pdfIn PDF document text
    • http://sisiwovad.pbworks.com/w/file/fetch/144731340/kiludoturagijumudunerigi.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/w/file/fetch/144584796/41357702956.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/f/zugexudanukubanojap.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_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 4704 bytes
SHA-256: c574395d199759db38ac22b2bf23762684159003a6b27c33afa4dbfc8e8ec96e
font_01_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 10288 bytes
SHA-256: a6353272dfc291770fd0b548d36450915bd8eb6617e46fe320cffa7df1b19137
font_02_sfnt_off00010c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176