Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d7b169c6f5b6bd…

MALICIOUS

PDF

84.0 KB Created: 2021-04-03 20:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 98bbf6fa038c68d2752b3538756a332a SHA-1: cd26a46e751a3219056b35d0a1fc1ea59bd0f49b SHA-256: 12d7b169c6f5b6bd391c69255d3bcc55d4e53bdd810ea693c5843f63e531e44e
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it functions as a link farm on disposable hosting, aiming to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to a Tascam 414 mkii release date, suggesting a lure to a phishing or malware distribution site. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jacksth.ru/strik?utm_term=tascam+414+mkii+release+date PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410201/normal_6033e0a004802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_601cb0678bb57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371495/normal_5fe02d46d1c33.pdfIn PDF document text
    • http://jitokinut.iblogger.org/af-_5xhd_user_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417049/normal_6054d3da32fe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_603778d8cecb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404308/normal_5fd0dcf3abd60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_602f7611704bc.pdfIn PDF document text
    • https://cdn.sqhk.co/livulopo/flp5DKy/disney_movies_new_cartoon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5ff5588ce73c5.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/dieNJCm/sozefa.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/fjcB420/77744218681.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/jjj3C2Q/zifakewonotezobasutebuma.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/nevovumowa/cdpo_ka_full_form_kya_hoga.pdfIn PDF document text
    • https://b416d2a3-330e-4518-8f5e-c931256b4cd1.filesusr.com/ugd/5168b2_8735ab36b1734e2e90f4c75fc02c1d61.pdf?index=trueIn PDF document text
    • https://69b12d55-863e-458e-a545-ad358ed6bd1a.filesusr.com/ugd/a9642c_167d6ef7664f4a9ea1e71e0c82c93e23.pdf?index=trueIn PDF document text
    • http://veveliwuw.rf.gd/twilight_download_in_moviesda.pdfIn PDF document text
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_3bc45cd4977d4e988b277b93649d6fb8.pdf?index=trueIn PDF document text
    • http://mutifitiwexo.epizy.com/gumapujajuleruginin.pdfIn PDF document text
    • http://terefikug.epizy.com/albinismo_genetica.pdfIn PDF document text
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_56680db270c04e3799edc9ccd6f3da51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/rewalutomujosexexoliwugi.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/mesoso.pdfIn PDF document text
    • http://gusutawidike.epizy.com/96410048906.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/christmas_vocabulary_worksheets_for_esl_students.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/21078663937.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_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 5240 bytes
SHA-256: 48a378bf9557202af5db58c814d6f553487ff9d061424b08c24ec67d32771d3f
font_01_sfnt_off00011afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 11540 bytes
SHA-256: 7ee2569577167321be6ca6e9349c6754ea58d9d545dc366c8f03ab7cc31677d0