Malicious PDF — malware analysis report

Static analysis result for SHA-256 73041773a45f657d…

MALICIOUS

PDF

69.3 KB Created: 2021-02-21 22:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 079cc57a041546f71c247b5143afc2a4 SHA-1: 5f1d677475668cf8af79a16c4db58855e6550a47 SHA-256: 73041773a45f657d61fa06868fd42c3c68b0344173dfcda0bdd69e6de03c80e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content.

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://seumenha.ru/wix?keyword=riddle+school+games+6 PDF link annotation
    • http://urologo.store/bifuturafulepaxinovkzew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426558/normal_6000498a0b387.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366057/normal_5fe39de4e401f.pdfIn PDF document text
    • https://kixarazebeda.weebly.com/uploads/1/3/0/7/130776474/pumugiligofesuv_lorisul.pdfIn PDF document text
    • https://negogesi.weebly.com/uploads/1/3/0/7/130739616/dbb9de258b5c.pdfIn PDF document text
    • http://presentinsta.online/red_wine_sweetness_guideue7bv.pdfIn PDF document text
    • http://how2clever.com/ar_rahman_hits_songs_masstamilan1uitn.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/3002963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_6012bfbc83a81.pdfIn PDF document text
    • http://wbigs.space/diversey_driving_range_dress_code7o8e5.pdfIn PDF document text
    • http://tronreserve.online/download_old_ringtones_for_android31hvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_601ef587731d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_601a40533a625.pdfIn PDF document text
    • http://daravto18.ru/kodakugupovikuredino977q9.pdfIn PDF document text
    • http://topshops.website/sh_digraph_printable_worksheetsxj9i3.pdfIn PDF document text
    • http://baykamif.space/23312923996lnoim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372740/normal_60084caf3be37.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/3665365.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/xukanomarexumu/lagu_ost_film_ajari_aku_islam.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_off0000d316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 5416 bytes
SHA-256: 529598c014a695c6bffa6212a1033204e15b0d1683f4d7c248428a37ed09d3c9
font_01_sfnt_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 10272 bytes
SHA-256: a9081ffa8b777daf53802e610dde9d85749d3bf04dc2cfa470eb11a57270c11d

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