Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b44587cd05184d…

MALICIOUS

PDF

75.3 KB Created: 2021-03-15 00:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bdbfa143dd6cc26d9b6c79cbcec69e2a SHA-1: 9eb9f29e1c817165fe0daa9c0c2de5310fa1daa7 SHA-256: 61b44587cd05184d6f42e3f2a8846b42d6f4b18a1f04e55ededb49d8bd2b5013
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded URIs indicate it's intended to exploit vulnerabilities or trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=bluebeam+revu+training+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471692/normal_5ffdead06196b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418365/normal_5fc73d4c13004.pdfIn PDF document text
    • https://xemamipu.weebly.com/uploads/1/3/0/8/130813095/sibukuxava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_604e8d8162bda.pdfIn PDF document text
    • http://teachost.com/kudijuzikojumipujekpzkjz.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/jheeKji/zoradelel.pdfIn PDF document text
    • https://gexoronigiz.weebly.com/uploads/1/3/4/2/134265935/4078224.pdfIn PDF document text
    • http://bravos-kids.ru/tearoom_trade_definitionte74s.pdfIn PDF document text
    • https://golotarati.weebly.com/uploads/1/3/1/8/131856611/35bcdbba.pdfIn PDF document text
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/denek-sakosuwol-jifedi-bivoduwedelalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_5fd70c633aa9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_6004f0ba1c158.pdfIn PDF document text
    • http://setlyb.online/film_synopsis_examplesbeml.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/Wieifij/5530687573.pdfIn PDF document text
    • http://mattelipsticks.site/pudosiviwekfj55.pdfIn PDF document text
    • http://yandex-dostav.ru/nubezizikinobapie5iu.pdfIn PDF document text
    • https://waramexebogod.weebly.com/uploads/1/3/1/8/131856917/2590818.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/AlgcYhg/move_to_ios_app_not_working_samsung_s8.pdfIn PDF document text
    • https://mikuloxituxawe.weebly.com/uploads/1/3/1/4/131410747/sololorogawuzerot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/603d3b0d-41f2-4741-b3e1-0e9f47e5ef15/31360793713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1e1a20-833d-4f08-b822-034b6d1c268a/xotijizetiv.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_off0000e67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 5432 bytes
SHA-256: 7c8b0540c93ab458a20062c3fe36af193a5f816110e1759caf2ea67f19a52f96
font_01_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 11024 bytes
SHA-256: 23b51ccdb5c94fd53581b6384415645bcb38c97d0ee7ab0fd53aa120f61f25c2

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