Malicious PDF — malware analysis report

Static analysis result for SHA-256 0577405c94ca8a7b…

MALICIOUS

PDF

71.7 KB Created: 2021-02-21 05:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 63275216636c2f521030a784e04bf4c7 SHA-1: 29745943ea383b93046de9f29f254483536994aa SHA-256: 0577405c94ca8a7bd61f3bef469d7a852f0dd05d2fbd9ad5692194fe90d0c62e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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://jacksth.ru/strik?utm_term=2004+dodge+ram+1500+5.7+hemi+engine+for+sale PDF link annotation
    • http://fupomogusi.22web.org/commerce_and_trade_group_salary.pdfIn PDF document text
    • http://sanikeroror.iblogger.org/zizulozig.pdfIn PDF document text
    • http://guferesuzas.22web.org/education_portal_e_kyc_report.pdfIn PDF document text
    • https://cdn.sqhk.co/kadefowuvun/bjes8PA/robots_vs_zombies_attack_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_601e8b5deaba6.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/tavadi-mekarezap.pdfIn PDF document text
    • https://cdn.sqhk.co/loxinesupiva/uHjjAjh/timisulawir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_600a0b07e003d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413566/normal_5ff4ab1cc6e5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427514/normal_6026f3b587650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446645/normal_5fe9ea52bfb05.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/jgjiibM/wrestling_revolution_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_5fd0a7cf91a37.pdfIn PDF document text
    • https://cdn.sqhk.co/xisofofumew/ebwhf8D/yellow_app_icons_iphone.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
    • https://s3.amazonaws.com/zozuxukoxo/zakokusudibafaw.pdfIn PDF document text
    • http://kapixij.epizy.com/similar_polygons_worksheet_answer_key.pdfIn PDF document text
    • http://gedikoti.epizy.com/avast_free_standalone_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/nezitup.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_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 5584 bytes
SHA-256: fb2b74526b828a05ae6074325eb634a0b1d6cabd32f12a7a15cb8cad567b6d24
font_01_sfnt_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 10736 bytes
SHA-256: 6da8e0ae8c75c36ed9251cf9d9fca1087a2f7a85dfc9d0b1399dd0e373450ca7
font_02_sfnt_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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