Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ab7fb33e919da2…

MALICIOUS

PDF

85.9 KB Created: 2021-02-22 02:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3c9057ef1a6ba3a7522a74cd772e9d48 SHA-1: f9366542bf4e517ea3002d74fe55e7c8c630d53f SHA-256: 20ab7fb33e919da261e9907c36a217b3d19e51e11dc2810bdc5ea7d0fc08db10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=2008+jayco+greyhawk+owners+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460723/normal_5fde029884795.pdfIn PDF document text
    • https://jitugitux.weebly.com/uploads/1/3/0/7/130740190/dajepal-gigemavu.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/iBhj4ih/droid_depot_dome_options.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_6026f1df5874d.pdfIn PDF document text
    • http://lisifakus.66ghz.com/tazazafamuditul.pdfIn PDF document text
    • https://lunokebu.weebly.com/uploads/1/3/4/6/134648327/4078f03625.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/DgiGgfP/craftsman_construction_inc.pdfIn PDF document text
    • http://rijafinawaxus.iblogger.org/sebawepipejo.pdfIn PDF document text
    • http://dizodiruliwujoj.22web.org/attack_on_titan_anime_finished.pdfIn PDF document text
    • https://favesalaliba.weebly.com/uploads/1/3/1/3/131384568/6845092.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/jiRajaA/zig_zag_lines_road_uk.pdfIn PDF document text
    • https://jirakeleda.weebly.com/uploads/1/3/5/9/135992973/cc532d88f82cb4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456671/normal_601a3387d6fe9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://momerulazem.rf.gd/bullet_basya_movie_song.pdfIn PDF document text
    • http://jamurujitexezi.epizy.com/chromecast_software_pc.pdfIn PDF document text
    • http://vasenatisa.epizy.com/rubupetavejenosupom.pdfIn PDF document text
    • http://debefataxa.rf.gd/gosipuwutebiwirobuzuw.pdfIn PDF document text
    • http://kefabebabefi.rf.gd/descargar_plague_inc_full_apk_espaol.pdfIn PDF document text
    • http://rilobun.rf.gd/business_code_of_conduct_template_uk.pdfIn PDF document text
    • http://ronopijitol.rf.gd/wall_street_journal_subscription_student_discount.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_off00010aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 5920 bytes
SHA-256: 7bfe172edcd589769941fee291d5386c7b609213d303768c27d2bbe2aea2e7ea
font_01_sfnt_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 12788 bytes
SHA-256: 6386b061e8e1296e30c881e3043b5464825f40022d0a4876b9c0c5039d0d0713