Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda86fa2bb14f1e7…

MALICIOUS

PDF

125.2 KB Created: 2021-03-29 07:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b32859127934d1d4cc675e521805bc64 SHA-1: dc06d9f73f2e434ca150d9d0963463dd57ff9683 SHA-256: fda86fa2bb14f1e7bbdf7439fd62e59f0a3f96cf12153f27587f9c2a81691585
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded links pointing to various domains, many of which are hosted on disposable or dynamic DNS services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=95+s10+ignition+switch+wiring+diagram PDF link annotation
    • http://cyberghost.store/24613811396qek0y.pdfIn PDF document text
    • http://ig-mediateam.net/kovibutorituvulezoraru3ufcv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_60184b4c5a9d9.pdfIn PDF document text
    • http://birixuxewazotaz.mywebcommunity.org/23045237443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415525/normal_60430363be6a3.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/python_django_interview_questions_and_answers.pdfIn PDF document text
    • http://timujegewaverun.22web.org/how_to_fix_ge_microwave.pdfIn PDF document text
    • http://liwonixaxe.iblogger.org/lukurolevab.pdfIn PDF document text
    • http://disclosures.space/64896116812mbocg.pdfIn PDF document text
    • http://tixokapine.mypressonline.com/82197312491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5ff1843a913ff.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/super_mario_land_2_for_gameboy.pdfIn PDF document text
    • http://mynasert.online/35444738490cye2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_60445a2768756.pdfIn PDF document text
    • http://copyrights-notices-helps.com/zumisuwu33rk8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lezefivupeke.epizy.com/17067322605.pdfIn PDF document text
    • http://xusoromi.epizy.com/35852793874.pdfIn PDF document text
    • http://sokagozu.rf.gd/bovisa.pdfIn PDF document text
    • http://kolofagigetu.epizy.com/valimofebud.pdfIn PDF document text
    • http://sujunutab.atwebpages.com/business_strategy_sample.pdfIn PDF document text
    • http://jinesiwi.epizy.com/blue_menu_shepherd_s_pie_nutritional_information.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_off0001ab62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB62 5792 bytes
SHA-256: 4243c2ee541ded3ac8de664a7657cc02d3f284f728a06708da7dc61a3b26d9bd
font_01_sfnt_off0001bf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF0D 11660 bytes
SHA-256: e3f1a3c1331582a8c744ee592d0237a4139af2a01d42cf94504860a1720ed10d

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