Malicious PDF — malware analysis report

Static analysis result for SHA-256 9419f58ba9dc78a4…

MALICIOUS

PDF

78.2 KB Created: 2021-03-28 17:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 793a8c0fe0bc368f86a450cbc484bf66 SHA-1: c5e4b48cf895c92b985f5fc6c81715614bc870ed SHA-256: 9419f58ba9dc78a49ae613d920c7ad357828e121a7f66c9e5ce31cf18f593203
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains a high density of embedded URLs, many pointing to disposable domains, suggesting an attempt to redirect users to malicious or phishing websites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=bloom+s+taxonomy+domains+pdf PDF link annotation
    • http://canonsburglake.org/salowipibebanizeof2d.pdfIn PDF document text
    • http://nibelv.xyz/how_to_delay_court_proceedings4efpb.pdfIn PDF document text
    • http://arfesopt.com/32289104383c248c.pdfIn PDF document text
    • http://reduslim-sito.site/soligufena1tl5l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393036/normal_5ff28c59310b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_60383a4be7793.pdfIn PDF document text
    • http://ar-foto.art/digital_photography_camera_meaningl818r.pdfIn PDF document text
    • http://hugertely.xyz/bluebeam_serial_number_and_product_key_crackkyi83.pdfIn PDF document text
    • http://laitlabs.pro/which_atom_in_each_pair_has_the_larger_atomic_radius_circle_your_answer5vsrm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_605cb3e2a9223.pdfIn PDF document text
    • http://presalle.xyz/surah_mulk_english_translationsc9n7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477649/normal_60275ab64ff6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_601a355e8753e.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/dumupa/13359764360.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/79016371241.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/ratiw.pdfIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_002c752fd49f496d959a82504703af42.pdf?index=trueIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_8a86a39e03ef49b2a6e8a4ed0a551e7d.pdf?index=trueIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_8c3aa777e0fb4657aeef582866bc7194.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/74231522279.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_a4709f1b76ed462e85d72df5ded08f1c.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_8a573e934cdb489e80b2d05e1630fa16.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_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 5308 bytes
SHA-256: adbe9a993c9bce8af5acd221c6cab7705bf5cb38d160ac22a00d2af09e925e65
font_01_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 11588 bytes
SHA-256: da66e39276d6bf586065184b09fc7713f30d83f7f25806e5d2066d39600e24b4

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