Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba35ff7acc68780…

MALICIOUS

PDF

76.4 KB Created: 2021-02-22 23:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4176caecc03d4694edc1eec4ea8f2e6d SHA-1: d38f13a2088a12039950a21a13a045d273cda14a SHA-256: 1ba35ff7acc687806883371b6e4ac7ff046123377f6f135568751e607a3718d2
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a prominent one pointing to 'jottigo.ru', suggesting it's designed to redirect users to potentially harmful content. The PDF's structure and embedded links align with phishing or malware distribution tactics.

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://jottigo.ru/strik?utm_term=resistance+band+exercise+program+pdf PDF link annotation
    • https://cdn.sqhk.co/zidodovare/gexG510/stickman_and_gun_3_zombie_shooting_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370053/normal_5fe196de611c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_601fe9452ecfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417528/normal_60278d981d13a.pdfIn PDF document text
    • http://soribowunalosu.22web.org/pathology_of_glioblastoma_multiforme.pdfIn PDF document text
    • http://gadokuzepot.22web.org/lvp_flooring_thickness_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guzeberipavol.rf.gd/lofi_study_beats.pdfIn PDF document text
    • http://zowujobosega.rf.gd/85276231326.pdfIn PDF document text
    • http://wodasakuzetu.rf.gd/bingo_cards_template_1-_75.pdfIn PDF document text
    • http://rapuzivawa.epizy.com/league_of_legends_champion_mastery_points_guide.pdfIn PDF document text
    • http://bekogufepe.rf.gd/french_dictionary_audio_pronunciation_free.pdfIn PDF document text
    • http://xumomevafuvozup.rf.gd/formation_of_carbanion_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/xazidukuf.pdfIn PDF document text
    • http://toraxetutat.epizy.com/wametigox.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_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 5656 bytes
SHA-256: 98bae32db7ce751932b9a18479ef42f85099add15c85796ae5a8fadd3e2e1272
font_01_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 11044 bytes
SHA-256: 8ffaecd34f96842ab1b3deeda10f4cc56ea3cd2c7ce0a550b01437f8716ca404

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