Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed671ce93a34af6e…

MALICIOUS

PDF

79.1 KB Created: 2021-03-06 06:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ab740577a7fdae344bdee2561716e5de SHA-1: 30bcc0538c9fc51bb9d736c5ff5daf6a2abd3ca7 SHA-256: ed671ce93a34af6e8b20a9cff5a8edc41ab280abc141a6817a365f5146da4446
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, references installation instructions, serving as a lure to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9037

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://vilenefex.ru/award?keyword=how+to+install+hampton+bay+universal+fan+remote PDF link annotation
    • http://tudetiva.iblogger.org/xupetawiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470836/normal_5fdb5e09c3306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_6029cb7079fe0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5fee270d15d05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374177/normal_5ffdfb263b40b.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/1JF5nGo/go_gaia_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_602197853403b.pdfIn PDF document text
    • http://dezlice.ru/139493609072hkn9.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/jgIzja3/diversion_safe_stash.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5fc87dba7eb6f.pdfIn PDF document text
    • http://kengoru.space/wrong_turn_4_hd_moviejadsg.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/giaXigU/kinawubaketoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501963/normal_5fea21fd62afd.pdfIn PDF document text
    • http://sodaapp.club/18957294944dxqaq.pdfIn PDF document text
    • http://socialwave.me/lewis_medical_surgical_nursing_10th_editioneqny8.pdfIn PDF document text
    • http://zespodsvetkoy.site/how_do_you_make_someone_fall_for_you_over_text_messagesi1wew.pdfIn PDF document text
    • http://reduslimitalia-official.website/rockstar_arabesque_freecxcca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_5fe7a14a4c828.pdfIn PDF document text
    • http://sokolov.fun/function_pointer_template_parameter_csjn8k.pdfIn PDF document text
    • http://zdsshop.top/tc_helicon_voicelive_3_price_philippineswf79d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420260/normal_5fc7fbe845bbb.pdfIn PDF document text
    • http://gnoogle.site/195757449566t0t0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujewejono.epizy.com/26441277900.pdfIn PDF document text
    • http://wexiwukivenuxaf.rf.gd/gefepukafeni.pdfIn PDF document text
    • http://sabixisadosafa.rf.gd/hematology_anemia_guidelines.pdfIn PDF document text
    • http://jipuzekas.rf.gd/puvagonusa.pdfIn 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_off0001013f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 5496 bytes
SHA-256: 2505cbae26b946d0fa027fb67e37488fc90feb610acdbaadbb72e0dff37a177a
font_01_sfnt_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 10536 bytes
SHA-256: 6cc4a911ae2b9bdfb614b9df9c57e48f64011f6f2ad3143a4dfb55ac0244467d

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