Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a5e10ea864d070…

MALICIOUS

PDF

82.9 KB Created: 2021-04-19 06:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 35f043d1562a6a073f4a88f2b76f966d SHA-1: 9851135c40047b17c621c428600c3fde3409c2c9 SHA-256: 38a5e10ea864d07050960824b1727079d59e73268e88a4b2d17f663a400e3cdd
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further indicate malicious intent. The document body, though heavily obfuscated, contains text related to a product search, suggesting a lure to a phishing or malware distribution site.

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://kuzutuzo.ru/strik?utm_term=garmin+vivofit+3+watch+strap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446283/normal_5fd79fc56a0c4.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/nubetapirefumafesezotozaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_6004078944a41.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/BKFKShj/mp3_cutter_and_ringtone_maker_premium_apk.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/14284047910.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/que_es_una_composicion_musical_y_sus_elementos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_60353c09a2bc9.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/60836212564.pdfIn PDF document text
    • http://norikaloro.mywebcommunity.org/skyline_travel_trailers_for_sale.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/27460123323.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/YYJifjj/deloitte_insights_future_of_work_in_manufacturing.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/juduk/pertussis_vaccine_in_pregnancy_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/what_are_non_verbal_signs_of_pain.pdfIn PDF document text
    • http://butorinowu.myartsonline.com/fender_mustang_3_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/zurego.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 5568 bytes
SHA-256: f2ba37fbe3971f4ac8f6eca6ed3ec72f10fc02f8d27d046ca2d1db4efc13b678
font_01_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 11188 bytes
SHA-256: 4f8e4e63deb602d778c81b84ba2cf2d7762934666f73018d67b199664d010057

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