Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a9bfd98fb0fef0…

MALICIOUS

PDF

72.7 KB Created: 2021-03-29 22:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bb56e0f6e9a89a5a6b9e8ffdb1878f9a SHA-1: 16a1f8a87547d97c6e44d27e760eff3132ad7f92 SHA-256: 37a9bfd98fb0fef015c5001ec450ceeb40a67456d19f22fdb45ac46028ba8033
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/aws?utm_term=chamberlain+universal+wireless+keypad+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481671/normal_5fd9a0efd7ec5.pdfIn PDF document text
    • https://kafedujewerom.weebly.com/uploads/1/3/4/6/134622586/1360364.pdfIn PDF document text
    • http://faxozulakevosos.iblogger.org/92162905076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5fd193f009534.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370288/normal_5fdd28faeddd7.pdfIn PDF document text
    • https://gosasaweju.weebly.com/uploads/1/3/1/3/131384289/rofakirobu.pdfIn PDF document text
    • http://mailedflkf.site/jixibizotubararexonox419r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wowadepadon.rf.gd/gupelomobozotumanavuxitur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde17355-6d14-4221-b877-0e90685caf13/varozukolag.pdfIn PDF document text
    • http://zetijub.epizy.com/gunosuponidal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc45644b-9f50-49ae-bc8c-06d69e60a2a4/96046289311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45713ae-9a41-456a-940e-5e9485805cee/why_is_my_juice_wireless_charger_flashing_green.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ca0c4f-4f51-4796-abec-c7af868c3853/narrative_writing_samples_for_4th_grade.pdfIn PDF document text
    • http://dinopug.epizy.com/basanti_song_telugu.pdfIn PDF document text
    • http://gojesetikibal.epizy.com/48935398937.pdfIn PDF document text
    • http://fevufubot.rf.gd/business_plan_template_for_online_startup.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_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 5564 bytes
SHA-256: bf8f6ac05c71a2aee555b906cfa8c8f7e38d53494a502fc1efd78f7795e61e4b
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 12192 bytes
SHA-256: 8f6f53fd19d1639c0ad9cfd23f5f61d4c81825bdf1e57dbfb8b6c7301c43ee5b

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