Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3216d2bd8bed3c…

MALICIOUS

PDF

81.5 KB Created: 2021-02-26 19:09:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4d55facc76bf1369118c8037713c8c0c SHA-1: e3e55600a33001d21b09924d9ee987907b003b65 SHA-256: da3216d2bd8bed3c183a57bdf52f6ae9af0e3bbf31a64dbd997d6fcd27d0bfb7
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary one pointing to zajinet.ru, likely serving as a lure or a distribution point for further malicious activity. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=hip+hop+drum+beats+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453719/normal_601cddffe24d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374517/normal_5ff289c8894b3.pdfIn PDF document text
    • https://bovuzujavus.weebly.com/uploads/1/3/5/3/135326818/7861423.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388040/normal_5fe3be2775e80.pdfIn PDF document text
    • http://moperala.iblogger.org/ascus_and_hpv_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470825/normal_5fd882053a0af.pdfIn PDF document text
    • https://makojinoguj.weebly.com/uploads/1/3/1/4/131406607/koviz-labiv-meweputuzewotot.pdfIn PDF document text
    • https://sokijolixorinus.weebly.com/uploads/1/3/1/1/131163896/256723.pdfIn PDF document text
    • http://serdyukov.pro/lokakejanesapiue9l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445325/normal_5fe51e97c2c3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zafagizidop.rf.gd/zukemojusubev.pdfIn PDF document text
    • http://zisunajupanege.rf.gd/chipmunk_tamil_remix_songs_free.pdfIn PDF document text
    • http://rukukuwozar.epizy.com/26798554316.pdfIn PDF document text
    • http://vefilemegukur.epizy.com/siduwulekozegujupubix.pdfIn PDF document text
    • http://zazuxevepiz.rf.gd/lijuges.pdfIn PDF document text
    • http://fidawakuxut.epizy.com/what_are_the_characteristics_of_classical_greek_sculpture.pdfIn PDF document text
    • http://jojanotesejivi.epizy.com/54941529450.pdfIn PDF document text
    • http://wiwowefitupek.epizy.com/33835634192.pdfIn PDF document text
    • http://xumizaxojumiko.epizy.com/electromagnetic_spectrum_powerpoint_template.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_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 5348 bytes
SHA-256: 65bc9a3b8f1780a8d1b8fdef49328c491a65a8afb2130882afc40ba79f27bf8f
font_01_sfnt_off0001138d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 10824 bytes
SHA-256: 754a63edd890be6feab1735683c664a413d798359aa307a7f64a69338814fa0f

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