Malicious PDF — malware analysis report

Static analysis result for SHA-256 d438b3ba3f781df8…

MALICIOUS

PDF

104.7 KB Created: 2021-02-09 23:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9f9e88dad1c00db21bdecfde2d7d2efa SHA-1: a6120710fe10ac0e80afc3f09be9018d5ea42cba SHA-256: d438b3ba3f781df8c30288bfff1b72e844255556242e8a67cb72872580121ef2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'bologen.ru', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=pirates+of+the+spanish+main+rpg PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383804/normal_5ff63ae7b79e5.pdfIn PDF document text
    • http://marketop.club/299702498084qkr9.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/eoUwjhX/mamanelufupudofaweku.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/iGOaivo/15728948847.pdfIn PDF document text
    • http://vexidizagopukib.22web.org/variedades_de_cafe_en_mexico.pdfIn PDF document text
    • http://jidugisukeranav.iblogger.org/58766569042.pdfIn PDF document text
    • https://cdn.sqhk.co/refevebux/bCvuFie/notification_sounds_win_10.pdfIn PDF document text
    • http://jelabenix.22web.org/antibiotico_farmacologia.pdfIn PDF document text
    • http://satofaxa.iblogger.org/96510415982.pdfIn PDF document text
    • http://skidki-day.store/dalesetgu2.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/diiwMih/84804042227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5fffd0ec5c0b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496151/normal_5ff8ed9abe907.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467286/normal_5fc9861a940d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giwofigu.epizy.com/39057988087.pdfIn PDF document text
    • http://rumejumobu.epizy.com/new_stylish_bengali_fonts_free.pdfIn PDF document text
    • http://zivuneko.epizy.com/2415550968.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_off00015c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C77 5284 bytes
SHA-256: b6709b04ca85c0c53f8885080d3e6890ea6515b8bf0c7d56d0aaad6cddcb9ff9
font_01_sfnt_off00016e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E4B 11760 bytes
SHA-256: 3ed0a122b9c563dfce401581dd0e7bee5af8d40ecab70dcafc8b36b6c2e14f42

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