Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a84d03290bbead0…

MALICIOUS

PDF

65.9 KB Created: 2021-03-12 18:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f9e110a461f773505baebba5c83a8b7 SHA-1: 9b7bdf5ec55f1828964a1efdb1ab9db617bbb533 SHA-256: 1a84d03290bbead06754c91c43418bf4301a714b8bf78241b3af0ddede956392
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'jumiwimov.ru' and containing 'utm_term=about+face+hackworth+free+pdf', suggesting a phishing or social engineering lure. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=about+face+hackworth+free+pdf
    • https://cdn-cms.f-static.net/uploads/4413567/normal_60465df338c7e.pdf
    • https://static.s123-cdn-static.com/uploads/4373779/normal_5fcd67bd2aec3.pdf
    • https://static.s123-cdn-static.com/uploads/4491688/normal_5fe59753ec94c.pdf
    • https://cdn-cms.f-static.net/uploads/4497369/normal_601b3601043d9.pdf
    • http://medemukiduba.sportsontheweb.net/zosunivipiditi.pdf
    • https://static.s123-cdn-static.com/uploads/4425487/normal_6005f8a433e36.pdf
    • https://nuvarimo.weebly.com/uploads/1/3/1/3/131378817/depunasexera-vasewizewo-segirikesojez-muraxuru.pdf
    • http://xiwakaravivomik.scienceontheweb.net/definition_of_international_accounting_standards.pdf
    • http://valigulepi.scienceontheweb.net/72120604000.pdf
    • http://xorabawik.medianewsonline.com/chemistry_data_booklet_a_level_edexcel.pdf
    • https://zipuboxovasabe.weebly.com/uploads/1/3/1/4/131483293/livemopexezaven.pdf
    • http://mujabelor.mywebcommunity.org/10629210086.pdf
    • http://kimokabif.medianewsonline.com/87414497487.pdf
    • https://lapedifulijep.weebly.com/uploads/1/3/0/7/130739603/nizutaxamed_pifiga_wozozitit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://megigezorozo.atwebpages.com/dijituxokoremuruj.pdf
    • http://fetekovabu.onlinewebshop.net/computer_binary_code.pdf
    • https://s3.amazonaws.com/tenunud/bedujivezokorokozag.pdf
    • https://s3.amazonaws.com/febopa/cedaw_bangla.pdf
    • https://s3.amazonaws.com/nitizobuv/32396749519.pdf
    • http://mukanebesiva.atwebpages.com/best_stock_exchange_in_the_world_today.pdf
    • https://s3.amazonaws.com/juliziwojatige/albacore_tuna_fishing_report_washington.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c892.bin
5fd40f832d0fd5c1f101a353e248cdf7cf412fad9a5bb22cbd0daea1cd85f25b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 5320 bytes
font_01_sfnt_off0000dab4.bin
45065192a897e77469c9f00f26dedaa31fd4779b03f57e6fb6e69257b75ea335		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 9260 bytes

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