Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16197e69359dc1e…

MALICIOUS

PDF

81.5 KB Created: 2021-03-02 23:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 79b2c1f4b29d456f033a4114d8d0dddc SHA-1: 929d91d448029e7e3088321d0931ddebf474c775 SHA-256: a16197e69359dc1e1d491b5ec4bc04ffdb20784331e0a6a12bbddc66ffa73d35
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://jottigo.ru/123?utm_term=stanley+bc4009+battery+charger+manual PDF link annotation
    • http://varistop.site/puvuwediluwajedszs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412767/normal_6001d0ec0279a.pdfIn PDF document text
    • https://cdn.sqhk.co/ronuwimo/cifljjf/75068694237.pdfIn PDF document text
    • http://busivel.xyz/cub_scout_lion_guide_booksto1c.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/0ihlqeF/macmillan_higher_ed_launchpad_student_login.pdfIn PDF document text
    • http://hamsterbig.com/ver_spiderman_homecoming_latino4wknb.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/bj8oeTr/pikefabijetirulusim.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/bAhDLhg/strikemaster_ice_auger_drill.pdfIn PDF document text
    • http://bigpleasure.ru/802546751181eurj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fcc2d0edad02.pdfIn PDF document text
    • https://dawejiji.weebly.com/uploads/1/3/4/5/134505451/2395118.pdfIn PDF document text
    • https://vesifumami.weebly.com/uploads/1/3/5/2/135294942/rapikapipibexikur.pdfIn PDF document text
    • https://vilifamizebu.weebly.com/uploads/1/3/4/6/134617150/3786126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411483/normal_601995b289407.pdfIn PDF document text
    • https://ludutuwe.weebly.com/uploads/1/3/4/6/134687162/bewitajaturoko.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/VigTWuH/kuzejomuvujapag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_602738e35f199.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/92576002763.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_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 5768 bytes
SHA-256: b1452a4c5da407e0bede42959e8f485b6dbff45dc64d610e8922f46bcfbcc9ac
font_01_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 2048 bytes
SHA-256: f58dac70b5ce52bf81df34d1a822a0cb4f1e5c05be5d1d20ac4417136bd3fdfc
font_02_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 10996 bytes
SHA-256: a904e51a9217dc06962a124f029424f43bad17dc367382abda44b1bf7bf46499

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