Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf88ca7a21272b3…

MALICIOUS

PDF

77.0 KB Created: 2021-02-28 06:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 413ba2a0a544112129abb6d52734ac94 SHA-1: b2d0ca47cbc3265243c24ac34b98f5e2ced93088 SHA-256: 8bf88ca7a21272b3284c69a8fa175333f58878a998743870b7d344cf80e68f8d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

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://ponafet.ru/123?utm_term=what+oil+does+a+4.3+mercruiser+take PDF link annotation
    • http://krokoboko6.xyz/agile_methodology_scrum_vs_kanban0kqvo.pdfIn PDF document text
    • http://frankiearvelo.com/soap_cutting_asmr_clearoj34i.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/ggRC7TS/14929749046.pdfIn PDF document text
    • http://leree4.club/messenger_text_and_video_chat_for_free_androidrvs5a.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/PrCOaji/granny_smith_apple_puree.pdfIn PDF document text
    • http://keep-travel.com/download_shadowrun_pcbn2wd.pdfIn PDF document text
    • http://mubojumef.iblogger.org/nawatuwudin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486963/normal_6035a2170ef9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_601388901ff77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422894/normal_5fcc527921f47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367687/normal_5ffa1204c051b.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/HWLjiDj/vibukudiselu.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/9IvBric/dragon_ball_stick_shadow_war_fight_apk_1.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/jotogorurekuro/free_call_of_duty_1_trainer.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_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 5540 bytes
SHA-256: 83ce611c41e58be3f064c83bb4b022be468324d210157fb2db614c47709ef831
font_01_sfnt_off00010254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 10636 bytes
SHA-256: a0428c6f2e99ec005da0d4d4d42cc020b5d6f95e8700f1b33444163518c25216

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