Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fdb9be57fc8f15…

MALICIOUS

PDF

83.8 KB Created: 2021-02-22 08:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: eaacd5795c619a51d33b047964597dfb SHA-1: 63f386afc5932ff0dad0c2849c1fbdb15ac6f7b1 SHA-256: b8fdb9be57fc8f152f7859f313e0f208d1c8ea6355f3e5030980a6582c2c20e2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to malicious sites, potentially for further exploitation.

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://leonvi.ru/123?utm_term=tp-link+av500+powerline+adapter+with+ac+pass+through+starter+kit PDF link annotation
    • http://topvideo.design/the_alienist_downloadilp2u.pdfIn PDF document text
    • https://dawutika.weebly.com/uploads/1/3/1/4/131407504/lajakijajebiguw.pdfIn PDF document text
    • http://allfreebets.ru/128074020573ffv9.pdfIn PDF document text
    • https://xefobizedep.weebly.com/uploads/1/3/1/6/131636625/f9abf6d2e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405662/normal_602b0fc27c586.pdfIn PDF document text
    • http://creditscoreusa.info/tadunesis6uknm.pdfIn PDF document text
    • http://gnoogle.site/arduino_basic_tutoriale0kc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_6010d0bc5064e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478655/normal_6008cf3544d1a.pdfIn PDF document text
    • https://kunaxujo.weebly.com/uploads/1/3/1/4/131406864/2233510.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472213/normal_6000b1105d338.pdfIn PDF document text
    • http://gramnews.xyz/protect_from_forgery_with__exception0y6ce.pdfIn PDF document text
    • http://goossyy.online/texas_fire_report_maptrlg8.pdfIn PDF document text
    • http://podjem2.club/tulekaloxezubojitasozafiwk3a3.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/2537899.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/dixaleko/a_good_witch_s_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/queen_bohemian_rhapsody_guitar_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/xovod.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/after_effects_cs6_shortcuts.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_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 5796 bytes
SHA-256: e57e65cf2353a313fcda628474fa701e405c84bddfbd16b36abd89eb6cc77f5b
font_01_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 17172 bytes
SHA-256: c25bffbd652b5779d3e78be7d2aba86ebf3f270df08e3382d7ca1980a4747789

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