Malicious PDF — malware analysis report

Static analysis result for SHA-256 7169ddb16faaa147…

MALICIOUS

PDF

79.4 KB Created: 2021-04-27 13:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 75d12e4751bea34022f5ace7c81affa6 SHA-1: 6f4d9d0a78fb0fbd8ff3b416f9d6ac1636fe7893 SHA-256: 7169ddb16faaa147f373e14a6516addbf15ef82f063a8338db571963181926bb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary suspicious URL identified as https://soxebez.ru/strik. Heuristics indicate this PDF is a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature.

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://soxebez.ru/strik?utm_term=jude+the+obscure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5fe6eb6dcd7df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421036/normal_5fdca45b383d5.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/sat_math_2_official_practice_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_60245f68be873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393772/normal_6008e82999363.pdfIn PDF document text
    • http://kemutedetabu.scienceontheweb.net/acrobat_reader_download_windows_10.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/duwugewimajivizob.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/zukogi/thrill_of_the_chase_map.pdfIn PDF document text
    • http://bojepudadadax.atwebpages.com/58186197885.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/git_extensions_commit_template_branch_name.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_20c2a5550153481093f79f9e27cf54ff.pdf?index=trueIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_e6446cf6c8f149d883dbb0fd1db0a66e.pdf?index=trueIn PDF document text
    • http://litorow.myartsonline.com/tedokovoboxosilogisoral.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/ascanio_in_alba.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_48bf151b50f446b4a4a16aff8c127b73.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_012987d9ce504eb3ae9b5e3b6f165a71.pdf?index=trueIn 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_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 4916 bytes
SHA-256: bfc23f7cec15c912c252ed9cb157b52c2a28b164b15c61b6e95a12ec8e91ab35
font_01_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 11320 bytes
SHA-256: b3736ef702b32212fbbf83e2a7058f2e9eb0302b2c95a7afb52f1a18d13a6fde

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