Malicious PDF — malware analysis report

Static analysis result for SHA-256 a265ea735427e1cd…

MALICIOUS

PDF

73.5 KB Created: 2021-02-20 16:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2899d4661db22095b8dbcfffea3dc08c SHA-1: 5f63a3c853cd0aec5cad7ea1ee3bc885ecaac9b3 SHA-256: a265ea735427e1cd133c03bd3a83c9f591a391b717e2001fc9a94b4611c09092
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://bologen.ru/strik?utm_term=decoding+the+dna+of+the+toyota+production+system+harvard+business+review+pdf PDF link annotation
    • http://zoziwasikow.22web.org/chess_tactics_puzzles_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5fe80b1adb052.pdfIn PDF document text
    • http://kamini33.ru/vodajukb7j6n.pdfIn PDF document text
    • http://rakilepisejax.22web.org/18924998597.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/icBjfwe/marvel_comics_movies_2020.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/gixawetopoli/winrar_full_setup_free.pdfIn PDF document text
    • http://judixipe.epizy.com/nuxeminoromopiguraxe.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/lopelexemifozimujawi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/ladujibegobefi.pdfIn PDF document text
    • http://lavofedelozus.rf.gd/autonomous_underwater_vehicle_seminar.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_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 5932 bytes
SHA-256: 7020bdb3d9d74311d63a9d6db3f4fed0c404eae83ae26e5883a32d32ba452ee9
font_01_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 10544 bytes
SHA-256: 45e25d4dd51be6d6dc07e0d42ddd7d42c127842166278c5c87712c22687f89ec

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