Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4d361524bcff70…

MALICIOUS

PDF

73.6 KB Created: 2021-03-19 23:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2563c46452e747bc1239a29791766d87 SHA-1: 160332c7c0244d8139b90cbe13c6d19c8da1814f SHA-256: 8a4d361524bcff70474858824fde64efc2d733719115b33d0e643bb8f3a17e40
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 0.9998

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=dungeons+master+guide+3.+5 PDF link annotation
    • http://fringigejy.site/81234653409j2s.pdfIn PDF document text
    • http://gopururin.iblogger.org/bks_iyengar_yoga.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/nintendo_wii_rvl-001_blackgs0yv.pdfIn PDF document text
    • https://gagoduxo.weebly.com/uploads/1/3/1/4/131452981/7ae9e26c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366336/normal_5ff50820d10be.pdfIn PDF document text
    • http://urolog.xyz/best_exercise_music_free4i3xp.pdfIn PDF document text
    • http://zonixutazexe.iblogger.org/why_was_george_killing_lennie_justified.pdfIn PDF document text
    • http://jibuveborufo.iblogger.org/jalaj.pdfIn PDF document text
    • http://gradstroy.su/ligoxixewarubvey1i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499979/normal_5fd091ca6fac9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412900/normal_5fffc1484f8b5.pdfIn PDF document text
    • http://hustlinmoney.com/pokemon_omega_fire_red_download1brkd.pdfIn PDF document text
    • https://busejutepegojo.weebly.com/uploads/1/3/4/7/134773147/5254287.pdfIn PDF document text
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/sunuzerin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_6030369ae7151.pdfIn PDF document text
    • http://yandex-delivery.cc/jumidaykjv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rafopaju.rf.gd/bajowo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD484 5316 bytes
SHA-256: 1c13736dea8d5d5037f28da5f0394a52ed76ce8d39f27af0084a13846b93a02c
font_01_sfnt_off0000e685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 10572 bytes
SHA-256: a43bcaf8e190bffd1ce7821ca2fa8b82e68fdda05861d1c802367724f71451a6
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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