Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a431a0447530c5…

MALICIOUS

PDF

83.6 KB Created: 2021-03-03 11:10:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 91fea3dc5d1edf25d01436bd1ebf5c1a SHA-1: d152c9fc19e944e2db38323df6e3f8cf66c8cfbb SHA-256: 41a431a0447530c5fcf69d0c1c88d0365ada9578849ca7719e89ac517433dd28
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'seumenha.ru', which is likely a malicious domain used for distributing further payloads or phishing. The document body, though heavily obfuscated, contains text related to rabbit weight, suggesting a lure to a website.

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://seumenha.ru/123?utm_term=how+much+should+a+netherland+dwarf+rabbit+weigh PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471948/normal_5fe12c2f935a7.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/jfbbjhp/nuweboxuxewipawe.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/he5hhjf/rugby_league_19_game.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/gebj4ih/62285568451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475564/normal_600f1a9aeecef.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/Jhgjgge/duterte_fighting_crime_2_mod_apk_android_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366341/normal_5ffb5c582d40c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_5fe69a21547f4.pdfIn PDF document text
    • http://ruwosiju.getenjoyment.net/declaracion_francesa_de_los_derechos_del_hombre_y_del_ciudadano_1789.pdfIn PDF document text
    • http://igbusinessabouthelp.com/wallpaper_games_hd_android_darkojx6m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403685/normal_5ffd37174253a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411708/normal_5fcc4cde04c40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375087/normal_5feb205a1395a.pdfIn PDF document text
    • http://sewonmedix.ru/alternity_starshipsdjok0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_601786a82f5bc.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/djg4J8J/57941352242.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/81375702189.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/robumuduluwise/2015_ford_f_350_lariat_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/photoshop_elements_11_camera_raw_7._4.pdfIn PDF document text
    • http://lapetagalelan.myartsonline.com/lg_ducted_fault_code_ch_52.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/2004_polaris_predator_500_wiring_diagram.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_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 5628 bytes
SHA-256: 52814c401afaf31d4b1658193e3ade89e70e8e9e7918e4472def13a908f29af8
font_01_sfnt_off00011968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 11624 bytes
SHA-256: 7c29312690af152d9937de859126315f60e1230b3979245c7c53b28b7b9e3679

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