Malicious PDF — malware analysis report

Static analysis result for SHA-256 f670a142454c59b2…

MALICIOUS

PDF

78.3 KB Created: 2021-02-11 14:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0d014ce1e46a37a0c2cd4bd91cf7461f SHA-1: 7ab1a01dd0ed6e8aba72652079d1baef5d5a4ca0 SHA-256: f670a142454c59b25184da96dc2e1ad96c3feef845186fe16904ba74802e9dc9
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious or phishing sites. The PDF structure and embedded content indicate an attempt to disguise these links, likely as part of a phishing campaign.

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://seumenha.ru/123?utm_term=spearmint+rhino+las+vegas+yelp PDF link annotation
    • https://pinuwolaterogus.weebly.com/uploads/1/3/5/9/135957395/5a7eab72f9.pdfIn PDF document text
    • http://aviabileti.ru/duwajak6gm01.pdfIn PDF document text
    • http://marketop.club/odontologia_estetica_contemporanea_friedman59k6m.pdfIn PDF document text
    • http://instapodarok365.site/recharge_strength_prewoezckq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5feb6805cb205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_60147cf86ca93.pdfIn PDF document text
    • http://livethailand.fun/69633716643ali0u.pdfIn PDF document text
    • http://genoray.pro/4888731720620ugb.pdfIn PDF document text
    • http://ultra0.space/wudalikimujidudeuc35a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_601fa8786b0a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404308/normal_5fd0dcf3abd60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5ff711231e348.pdfIn PDF document text
    • http://detobusukited.iblogger.org/lord_shiva_mantra.pdfIn PDF document text
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/mogamaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/LYjhmhg/trucos_de_fifa_soccer_13_ps3.pdfIn PDF document text
    • http://fakts.design/rafokasux61g2o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kirawolus.rf.gd/army_shooting_games_free.pdfIn PDF document text
    • http://joxegav.rf.gd/uc_browser_free_laptop.pdfIn PDF document text
    • http://mubufelijora.epizy.com/search_engine_ppt_doc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 5288 bytes
SHA-256: 6d548419ce69485aea2bef44fc8b48528ed58f54e3b697bd44b070be5252e232
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 11440 bytes
SHA-256: 5ffee963b7e30ee7a77c1247174a8b3ea6c7c5f65ae6ec1116634dfea4575e52
font_02_sfnt_off00011df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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