Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d936acbca60c6d…

MALICIOUS

PDF

82.2 KB Created: 2021-06-02 19:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 883db28c0f0370da585816f25c9e58ea SHA-1: 7240d0b6cbcd3f83123a64c3b97b32b954ec0ea9 SHA-256: c1d936acbca60c6d4c3a4a7f5d120fdf7832964e5abcdb8d8a034eded106df52
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to link farms and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'Cessna 172 maintenance checklist'. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links for SEO manipulation or to host malicious content.

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://krisoc.ru/pbw?utm_term=cessna+172+maintenance+checklist PDF link annotation
    • https://zizobisorodevu.weebly.com/uploads/1/3/5/9/135964877/kabenigi-koguzopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_603e16ef022ff.pdfIn PDF document text
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/deteputox-talom.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4370286/normal_60afe4e60903e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_5fd13e6096f0f.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/jepevipulutafufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_5fd1d13d260bc.pdfIn PDF document text
    • https://dolufinome.weebly.com/uploads/1/3/5/3/135330980/527a0f.pdfIn PDF document text
    • https://werikaduf.weebly.com/uploads/1/3/4/4/134483952/tubuves.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_601c5d3a0ad8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lekuzax.pbworks.com/f/clash_royale_download_pc_windows_7.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/sokofafusab.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/w/file/fetch/144485169/five_nights_at_freddys_sister_location_free_download_ocean_of_games.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/swiffer_wetjet_mop_directions.pdfIn PDF document text
    • http://jijagenaneke.pbworks.com/f/lavinopaturum.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/apply_for_reduced_fare_metrocard_in_person.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/58939561032.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/f/how_can_i_teach_myself_auto_mechanics.pdfIn PDF document text
    • http://gemometis.pbworks.com/w/file/fetch/144502317/unblocked_games_67_wtf.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144416484/13173010163.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 4972 bytes
SHA-256: a4634482dc797c7d4c97956f97a76b0d4b6297cef3dd541beee338b532044311
font_01_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 10484 bytes
SHA-256: 3b19baeda6eed4f22f4d8a0794836c0e87db8fb98dbfb54b935357a665634c14
font_02_sfnt_off00012da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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