Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67ca8135edc0ffe…

MALICIOUS

PDF

76.8 KB Created: 2021-03-22 05:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 998139181bb9eea0dac27bf478cf2422 SHA-1: 089b5a843ac941c5e7fb667d41217d88d7e192dd SHA-256: f67ca8135edc0ffeb3fd16bdd5f2794dac410e9bc3c34db0e07a5a4541c77a10
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://lozipotod.ru/award?keyword=le+brassage+chromosomique+pdf PDF link annotation
    • https://cdn.sqhk.co/dutigimomana/eidSjbV/49800352257.pdfIn PDF document text
    • https://cdn.sqhk.co/ragonujip/2jaTjh5/jotomilefopifilunafur.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/tUiih0t/71810113134.pdfIn PDF document text
    • http://nititesosorejiw.iblogger.org/2005_dodge_ram_1500_fuel_tank_replacement.pdfIn PDF document text
    • http://gabupexijek.22web.org/89003456110.pdfIn PDF document text
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/vijexesoxosajab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_601643eb78711.pdfIn PDF document text
    • https://lajawirefif.weebly.com/uploads/1/3/4/8/134869340/787819.pdfIn PDF document text
    • http://zajawezexefijuk.22web.org/implosion_never_lose_hope_android_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_604ae1ab508a2.pdfIn PDF document text
    • https://tovakuroxi.weebly.com/uploads/1/3/1/1/131164121/titituji.pdfIn PDF document text
    • https://kasalaketowo.weebly.com/uploads/1/3/4/8/134871290/gopakupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410186/normal_5fdbab9e45e4f.pdfIn PDF document text
    • http://goproits.com/java_for_32_bit_windows_xphunrv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475565/normal_60065b1470779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455174/normal_6057e380aca4f.pdfIn PDF document text
    • http://coins24h.com/969312631430ed6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://losagamadupo.rf.gd/bukusi.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_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 5744 bytes
SHA-256: 9225216c4df8c46996657d9ab4f8ca8dca68dc2741c1ff6635784a7c6ed000d5
font_01_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 13420 bytes
SHA-256: c71142167d4674361fbddd7c51e51dd4e7e1d3b12e08ff897dd34b443d67a6d4

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