Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47dac892890a8c8…

MALICIOUS

PDF

83.6 KB Created: 2021-03-31 00:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3a3fb691c37d1e7f93ca2fa0a63df2cd SHA-1: 534523a005488f6ea462aebff0955452be7bce12 SHA-256: a47dac892890a8c82a1ae870afb0f950241608715569cfb18539f73cdb03cf99
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/award?keyword=basic+english+grammar+book+4+pdf+saddleback PDF link annotation
    • https://kesiwupi.weebly.com/uploads/1/3/1/4/131407351/lewaranulojamisaguzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_604b2f86468a6.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/giciigf/anyone_comics_brooklyn.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/jfBibX8/adjectives_and_prepositions_esl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451766/normal_6057fe5d04184.pdfIn PDF document text
    • https://fuxakitedev.weebly.com/uploads/1/3/5/4/135400966/fuzugerisuxe_faxuvepurigiwa_lurobawijureke.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/wGejctr/adobe_illustrator_2017_link.pdfIn PDF document text
    • https://lomofatawepap.weebly.com/uploads/1/3/4/5/134599642/xutipumolefatigato.pdfIn PDF document text
    • https://dusuwepi.weebly.com/uploads/1/3/4/5/134589125/ximogefak.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/notubajurog.pdfIn PDF document text
    • https://semitedajun.weebly.com/uploads/1/3/1/6/131636975/negovafitetana.pdfIn PDF document text
    • https://wiloropijevor.weebly.com/uploads/1/3/5/2/135299547/01b6bda3fac070.pdfIn PDF document text
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/8c785e970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/wupafumajumiriwokaminub.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/class_10_maths_book_cbse.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/law_graduate_cv_template_uk.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 5912 bytes
SHA-256: 09fa56b3768f51ef74b0ca9850f49bd11d41ac82c8bed1cbc73170ee7c3e6172
font_01_sfnt_off00011a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 11472 bytes
SHA-256: d3a6ceeedf134a52c32f9b4640dce99cc71405930200062eb1b463ecfa1f9665

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