Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86eb344449ccace…

MALICIOUS

PDF

72.7 KB Created: 2021-03-19 12:21:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9342d4abe305fb5c8d60c748d9196da2 SHA-1: da6e994ef585ae4fb1e27fcaa5a58bca8b4556a5 SHA-256: d86eb344449ccacea2860feef2c0af15bdf94b0a3ee7b064a999d06dd8e16f51
186 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=biomechanics+of+distance+running+pdf PDF link annotation
    • https://luwusimoxoxaxa.weebly.com/uploads/1/3/1/4/131453453/jigosisej.pdfIn PDF document text
    • https://nalabusapigo.weebly.com/uploads/1/3/2/7/132740218/gesasadapi.pdfIn PDF document text
    • http://sovuradema.medianewsonline.com/lunavimo.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/3234032361.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/ifjjZhf/neon_gaming_background.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/hbG7coT/30283184388.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/physics_work_and_energy_formula_sheet.pdfIn PDF document text
    • http://setopin.mypressonline.com/jiditekedudakar.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/bojujes.pdfIn PDF document text
    • https://zibitevurus.weebly.com/uploads/1/3/0/7/130776177/zekegubav.pdfIn PDF document text
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/lumitoxusazol_susedudexu.pdfIn PDF document text
    • https://wofinomedek.weebly.com/uploads/1/3/4/1/134108675/dogonuzeri_rojanareba.pdfIn PDF document text
    • http://lalabomujulimof.mywebcommunity.org/gubus.pdfIn PDF document text
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/6710652.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buzanuziti.myartsonline.com/6663824923.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/folipevetik.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_d85b6dbb4ee24aa09473ee501b481fed.pdf?index=trueIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_447dd71485824a898ff3ac4b1187e955.pdf?index=trueIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_e3695ef8a7b4492f96569b4755f891e7.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_81f8a2b6ebe34737a0deaad5abead07e.pdf?index=trueIn PDF document text
    • http://faleferesevo.onlinewebshop.net/ft_857_vs_ft_891.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_e7f564fa811f40a69b5d6b0c9d5beeb5.pdf?index=trueIn 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_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 5588 bytes
SHA-256: f55893a32a19f7d6afdc901d83e3e21049bbde25fa43ae74684649a0017978b6
font_01_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 10048 bytes
SHA-256: aa093a63b556c55ac8291cad1486e2b6d9fa897d747c4bded78c41c9538fb903