Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f744632540404f9…

MALICIOUS

PDF

78.6 KB Created: 2021-05-02 15:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0d51bc483e65c676fc383f143d1f02e2 SHA-1: 37302660a8e54bcb0e9d03b47a4647209085d8d2 SHA-256: 3f744632540404f9f9764ff8fed4dd29f85e69068ec22c15af15dd685eaed9a9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://lozipotod.ru/strik?utm_term=how+much+do+computer+engineers+earn+in+south+africa', is presented as a search result, aiming to trick users into clicking it. Heuristics indicate this is a phishing attempt, and ClamAV detection confirms its malicious nature. No scripts were extracted, but the structure suggests a phishing lure.

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://lozipotod.ru/strik?utm_term=how+much+do+computer+engineers+earn+in+south+africa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369796/normal_60444ae41195a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_606b3e15b4ab4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5ffade850cf15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454052/normal_6063bccb4576e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_600abef330aac.pdfIn PDF document text
    • http://caterm.ru/the_lion_the_witch_and_the_wardrobe_cast_ageu68br.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_6029656ba3983.pdfIn PDF document text
    • http://ceter.xyz/fitbit_flex_2_manualxhxfc.pdfIn PDF document text
    • http://creditscoreusa.info/duzupuwuduruposejarfe6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413976/normal_5ff1f654f3cb1.pdfIn PDF document text
    • http://pukatasenibi.iblogger.org/how_to_repair_rusted_truck_frame.pdfIn PDF document text
    • http://chelamela.org/13021609196s3da4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_602e0011617e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_606c6f10cc398.pdfIn PDF document text
    • http://vizionsmc.net/89848834302tumim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470226/normal_6067a0ea5d18d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476152/normal_5fcd0d3b63b35.pdfIn PDF document text
    • http://betixisu.22web.org/pewiwotowate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492574/normal_6025d556acafd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fejoxoxalomavo.rf.gd/diguladelolevewipoduru.pdfIn PDF document text
    • http://sumojoripira.rf.gd/crosswords_with_friends_answers_10_26_19.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_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 5588 bytes
SHA-256: a0c378dd05b05024d2b1ca865c520cd9d55839b112f707c6f9b98bc0a0d08083
font_01_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 11004 bytes
SHA-256: 3e212e8ca4bc40a7045aa266c6b46f4823011916d0282e1ee6a95acf27dad347

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