Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57c764e969c0ecb…

MALICIOUS

PDF

73.5 KB Created: 2021-04-08 13:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0a91ae0304f8b4013629d4a1705ed7a SHA-1: d246faeec7cd4e0a94c17e739212514eed9d956e SHA-256: c57c764e969c0ecbf5b66fa210a90a2d26dc774a9ab6ad05fa9af0b259df20e6
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to contain keywords related to medical conditions, likely serving as a lure to encourage users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/strik?utm_term=steroid+shot+for+costochondritis
    • http://vawurabel.mygamesonline.org/who_sang_have_yourself_a_merry_little_christmas_in_home_alone.pdf
    • http://mibilivo.scienceontheweb.net/63267731086.pdf
    • https://cdn.sqhk.co/wemorapi/zgiibjd/64734655016.pdf
    • https://static.s123-cdn-static.com/uploads/4477620/normal_5fedf9ffb9c0b.pdf
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5fd08bb068be7.pdf
    • https://cdn.sqhk.co/nalogigoke/ku6t231/brahmalokam_to_yamalokam_bhulokam_audio_songs.pdf
    • https://cdn.sqhk.co/ladesajisama/iaRjiTw/polaris_indy_adventure_155_review.pdf
    • https://cdn-cms.f-static.net/uploads/4369788/normal_60142e10d839d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_d4ce798515b745c199a1390b62aa5705.pdf?index=true
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_4c12ad20e20747b5b39f17f3ba84dab9.pdf?index=true
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_7d56ed6c6a6842bea69d9aeb0ee56689.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94454aa0-3487-4c86-af45-52e99c26b800/mathematical_logic_problems_with_answers.pdf
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_1cfaec6e8ec74bff8711a529e69620c4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e89ddad9-89b6-4970-946c-c8d026c85fb8/frigidaire_washer_and_dryer_stackable.pdf
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_3b46c9774a684c0a8dfcf96a7059a60b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/729d5520-69a8-4d73-8e16-18c7545aeec0/jorge_luis_borges_vida_e_obra.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_off0000e444.bin
641967756c5ba356c03233e579a90d5418023ccc9f8b0aadc163a514cdce234d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 4972 bytes
font_01_sfnt_off0000f529.bin
62790ff7fcb681af40b068a314afb03952ed9840f3f01455dc61ca13fe34944f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 10588 bytes

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