Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bfef4caa6f6dd7…

MALICIOUS

PDF

73.4 KB Created: 2021-06-11 10:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8c68610ac8ee52d80070126a06c96ac SHA-1: 79c00c89dfa0cedeca5bdf2a34c42bf006192f1b SHA-256: 65bfef4caa6f6dd7020b9a51a02a0c3519a24070b07da4ef591b288a6e424f6f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to drive traffic to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/pbw?utm_term=literary+devices+in+romeo+and+juliet+act+2+scene+3
    • https://static.s123-cdn-static.com/uploads/4420434/normal_60004438de6dc.pdf
    • https://zazetafulunemu.weebly.com/uploads/1/3/4/5/134599809/6096d1b8291.pdf
    • https://cdn-cms.f-static.net/uploads/4392864/normal_6037cee6a830f.pdf
    • https://cdn-cms.f-static.net/uploads/4418796/normal_60be5dbbe8a25.pdf
    • https://cdn-cms.f-static.net/uploads/4379974/normal_5fdab8eab8179.pdf
    • https://static.s123-cdn-static.com/uploads/4385202/normal_5fc8d7bf65fc7.pdf
    • https://cdn-cms.f-static.net/uploads/4408483/normal_605a1173a837d.pdf
    • https://cdn-cms.f-static.net/uploads/4449627/normal_60c07985baa21.pdf
    • https://static.s123-cdn-static.com/uploads/4375541/normal_600930c33561d.pdf
    • https://cdn-cms.f-static.net/uploads/4387928/normal_60620bd9677b7.pdf
    • https://cdn-cms.f-static.net/uploads/4426059/normal_603b600f592ce.pdf
    • https://static.s123-cdn-static.com/uploads/4374710/normal_5fe3aa42b5098.pdf
    • https://static.s123-cdn-static.com/uploads/4369908/normal_5fcad6c479dcb.pdf
    • https://static.s123-cdn-static.com/uploads/4407303/normal_5ffeb60619141.pdf
    • https://kisewosa.weebly.com/uploads/1/3/1/0/131070890/wovelonasajokuwanol.pdf
    • https://static.s123-cdn-static.com/uploads/4408851/normal_5ffa10b5b9f42.pdf
    • https://static.s123-cdn-static.com/uploads/4410717/normal_5fe0fbb3cce64.pdf
    • https://xisiwifuroki.weebly.com/uploads/1/3/5/3/135323104/105994a6d8e7dcb.pdf
    • https://static.s123-cdn-static.com/uploads/4375908/normal_5ffed04a34177.pdf
    • https://cdn-cms.f-static.net/uploads/4417519/normal_601ce34ea18e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xawasesofe.pbworks.com/f/sezatoxagojizoramo.pdf
    • http://faxamom.pbworks.com/f/free_vedic_life_report.pdf
    • http://lifevuve.pbworks.com/f/10_snf_biyoloji_ders_kitab_berkay_yaynlar.pdf
    • http://pozapagula.pbworks.com/f/juma_khutba_urdu_translation.pdf
    • http://wijozuzapusa.pbworks.com/w/file/fetch/145034835/tagalog_full_movie_website.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cf.bin
9c2e6e9cf74c03967070851e545cc56580ccebedc97e03554e7600d7cf273e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 5560 bytes
font_01_sfnt_off0000f5bb.bin
9e9b8d5e9204679e028ddb4c295e51e8910daba779dca9977ef5e4d700b162fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 10328 bytes

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