Malicious PDF — malware analysis report

Static analysis result for SHA-256 3741faf20faccc84…

MALICIOUS

PDF

88.5 KB Created: 2021-03-27 14:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f612808f6b183d1e54024beaf947f718 SHA-1: d83262939ad4abeef526336ae777d356f0d60a1d SHA-256: 3741faf20faccc843c59fa0a7dc521780a2002e8ce194ed5e9f6e296ea209fd0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it acts as a link farm or a distribution point for further malicious content. The presence of embedded URLs and the PDF's structure point towards a phishing or malware delivery scheme, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://druttle.ru/award?keyword=bodyweight+workout+chart+pdf PDF link annotation
    • https://cdn.sqhk.co/sagitusat/jiIjjvX/average_life_expectancy_uk_homeless.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/8daa661bdb.pdfIn PDF document text
    • http://wofupovuneraja.iblogger.org/62378477189.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/icibk1G/55630002461.pdfIn PDF document text
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/caba5386bb5b0d7.pdfIn PDF document text
    • https://zetojaxonafavop.weebly.com/uploads/1/3/5/3/135309172/2231352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461523/normal_600785834a363.pdfIn PDF document text
    • http://bizelapeto.iblogger.org/komeridifupirilu.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/gigvgdG/betatirazorufad.pdfIn PDF document text
    • https://manonerotorupu.weebly.com/uploads/1/3/4/6/134683358/jogabalobom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427282/normal_5fec061838a20.pdfIn PDF document text
    • http://fikepoj.22web.org/gefijemi.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/lefolomezolup.pdfIn PDF document text
    • http://givepamodugag.22web.org/zivejaridisowopubawixik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411511/normal_6021995cbaba8.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/80b17b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366311/normal_5fe3aa3aa0955.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_6037ffddbf5a0.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/557367.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lodajozaki.rf.gd/jibugutiret.pdfIn PDF document text
    • http://zusunikumejimet.rf.gd/37079909980.pdfIn PDF document text
    • http://regojefef.epizy.com/30668412368.pdfIn PDF document text
    • http://vubudeze.rf.gd/blender_animation_movie_tutorial.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_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 5512 bytes
SHA-256: 050bb3c84259f967d7284dbc5f469bcfe1c138dc5bdc764bbaa4d4240391f7e0
font_01_sfnt_off00012df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF8 10844 bytes
SHA-256: 164b1cf7c71495fecec34734d8d7edc47a0658fabb259942a2e026879c08fc49

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