Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16531a10444994f…

MALICIOUS

PDF

81.6 KB Created: 2021-03-02 19:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0215c9819d9efa403dc4f50e781e0577 SHA-1: 6d1a8fa053d63427385d944f071dc5528a543a36 SHA-256: a16531a10444994f3465d8f7ba6dc510b7ab95865359e13b6638e6eb8ca52b78
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the primary malicious URL being https://jumiwimov.ru/123?utm_term=what+are+bad+friends+quotes. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious 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://jumiwimov.ru/123?utm_term=what+are+bad+friends+quotes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443803/normal_5fef8fae677c1.pdfIn PDF document text
    • http://lixuzixewufixib.66ghz.com/zumiwoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457573/normal_600941d85f7d4.pdfIn PDF document text
    • http://tarusexozof.iblogger.org/xiridasojilaxumenabidubis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_603e26863f366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449402/normal_603218f36b20f.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/gcwjaii/64740532454.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454426/normal_5ff927cf328e3.pdfIn PDF document text
    • https://cdn.sqhk.co/joxopejufito/igwhemv/coffin_nails_black_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/dolavalof/vigSjjT/color_hop_3d_music_game_apk.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/5217278344.pdfIn PDF document text
    • http://afterdealer.pro/97104594782yzn9s.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/jcih3jg/warriors_roster_2014.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuwutexo.onlinewebshop.net/can_i_mix_perlite_with_cement.pdfIn PDF document text
    • http://gimelejikito.epizy.com/43277744384.pdfIn PDF document text
    • http://luzasuzudi.rf.gd/lunenopijel.pdfIn PDF document text
    • http://nafebuxu.epizy.com/werofufevazotas.pdfIn PDF document text
    • http://dixadenidufudu.epizy.com/zelekilof.pdfIn PDF document text
    • http://pezukovurarugor.rf.gd/80926487867.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_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 5244 bytes
SHA-256: 596c2b3185df64e306dcef99b5c3f9fb13aaa157ac88e8c31703792b139ec920
font_01_sfnt_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 10468 bytes
SHA-256: f04c32349e8f402bd746500104649a7ba80135ac3980202f50bffa190d2ef7e2

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