Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bf97a3ebf5fbdd…

MALICIOUS

PDF

80.6 KB Created: 2021-05-13 17:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 179cfa6ffa2ad40969c2af45a6334ef2 SHA-1: 44835d5044138fb04256c947e61729473231d08b SHA-256: c9bf97a3ebf5fbddb18bc793c1844fb33be10a2d6bd5e0a3c17fd1d809adb5db
126 Risk Score

Malware Insights

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

The PDF file is classified as malicious by ML models and ClamAV, and contains numerous embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, appears to be a lure related to risk management, directing users to external sites.

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://bologen.ru/strik?utm_term=how+to+analyze+the+risk+management PDF link annotation
    • https://cdn.sqhk.co/xuzalolotagi/yieCKij/pewokekexaragerixodimuku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447093/normal_5fef872e2dd78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459791/normal_5fcc8f02193f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476578/normal_602b335ea1cae.pdfIn PDF document text
    • https://cdn.sqhk.co/kavatupopum/jagghji/25505851159.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/rachmaninoff_prelude_in_g_minor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410002/normal_60052df098feb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_60131c10c47d5.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/mjcwpic/lock_screen_sailor_moon_live_wallpaper_iphone.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/nosuzimeg.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/2icxjft/frndly_tv_app_for_lg_smart_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/tricwge/zebomusuroga.pdfIn PDF document text
    • https://cdn.sqhk.co/sukonazukuv/hbheiiN/dhaam_dhoom_marathi_movie_star_cast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/173d190f-d756-40f6-ab02-2aed1f662666/how_to_change_a_honeywell_thermostat_to_a_nest.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/69496428641.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/blacklist_call_blocker_app.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/what_is_the_salary_of_a_automotive_technician.pdfIn PDF document text
    • http://kigokigaruv.myartsonline.com/what_is_the_enthalpy_change_of_a_chemical_reaction_that_raises_the_temperature_of_250_ml.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da03dfd-c461-46b7-85af-bb70a7cb954d/97005592735.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 5368 bytes
SHA-256: c88832d85ec7dd5eb0820bc125dfcf05b3b65b164ea725945ca465701b96a8e3
font_01_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 11512 bytes
SHA-256: 148ed37a0fc95e5bf741594e7e8ec32f3a28a8b7324bb6837a295be9a6433314
font_02_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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