Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c110c8357cea0be…

MALICIOUS

PDF

75.9 KB Created: 2021-02-15 14:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5b3409de9d9e8ba787d8ed5720670111 SHA-1: 91ea7bcdb6bf3a7557871a52e5d25e50a13b1ffc SHA-256: 6c110c8357cea0bea33b85bd2f51a244dc38b393f18623f58793d5efcd732def
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical finding for a PDF redirector link to 'https://yafferge.ru/strik?utm_term=80s+breakdance+music'. ClamAV also detected it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The ML classifier strongly indicates maliciousness. The presence of embedded URLs and the redirector link suggest an attempt to lure the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=80s+breakdance+music In PDF document text
    • https://cdn.sqhk.co/pajerelo/N1RrGgc/63228910168.pdfIn PDF document text
    • http://livecopyrightverification.com/social_security_card_font_type_and_size6ofj3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460690/normal_6000c11fa0f92.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/hajgQhg/nirep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_5fdbfa8b1dee6.pdfIn PDF document text
    • http://kyponnik.online/cursive_writing_practice_sheets_for_adultsqxhfh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370054/normal_5fc74510223e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375886/normal_600316b8833cc.pdfIn PDF document text
    • https://cdn.sqhk.co/memenewo/2hiojhS/gunowetiritewaso.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/igFwUhJ/arkham_knight_quickfire_line_launcher_xbox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408004/normal_5fc5ead0e05ab.pdfIn PDF document text
    • http://heliusdesign.ru/robinson_crusoe_short_versionzba4b.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/xotomisen/frommer_s_guide_northern_ireland.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/19019046144.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/24540259362.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/bangla_song_music_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/69847572135.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/fezuwim.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_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 5496 bytes
SHA-256: f8caf48b8f9a20073be3d56c9b60ec468a6e78178a72addd4f0b61c2daa273bd
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 17360 bytes
SHA-256: 1ae8d63c2e13893a61925251b44176033dfd23898553aeb3d28856251a455922

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