Malicious PDF — malware analysis report

Static analysis result for SHA-256 c116352cfa1b57d0…

MALICIOUS

PDF

68.1 KB Created: 2020-12-23 17:22:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b6d6aaa0f4e461f1edc06b395e2cdd0d SHA-1: 9e6fc85f7985c659431ecf6595ca1330674b22b3 SHA-256: c116352cfa1b57d0b493ff424abf0e8dc3ce5caa9fa5fb653b43feb2eea0cef7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a malicious intent. The presence of numerous external links, such as https://traffine.ru/strik?utm_term=skate+space+gameplay and https://cdn.sqhk.co/bagudivibi/Mgicfjj/86370429613.pdf, suggests a phishing or link-farming attack. The ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/strik?utm_term=skate+space+gameplay PDF link annotation
    • https://cdn.sqhk.co/bagudivibi/Mgicfjj/86370429613.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/hdgfbid/super_adventure_club_beliefs.pdfIn PDF document text
    • https://gozikiri.weebly.com/uploads/1/3/4/4/134493270/5988845.pdfIn PDF document text
    • https://cdn.sqhk.co/dudazume/igggjha/kumevapes.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/2MgiDib/cops_shot_knife_wielding_man.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://uploads.strikinglycdn.com/files/3efbc032-9afb-4bbe-9399-137d7066f8df/87351073032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a57fa3-8ea6-4762-8897-971bb710ff22/851019325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2db9d68-887f-4f52-9e11-dae1bcfedd87/29325323146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/814a87af-dd4b-46b0-bf01-518ee0ddd8ec/vlookup_excel_from_multiple_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791ca7a4-6b01-4dd2-815a-efd95fdfb501/simpsons_season_30_episode_2.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/fewunireriwowozu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA4 4952 bytes
SHA-256: 3b5a796023d09909162ddbbe8624b1e2d889fd206076f96f795c1828e3c41a27
font_01_sfnt_off0000bd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8C 10140 bytes
SHA-256: 5d62e3fa2fbb39408ad11cb1a60b21ef404b55115870efe74171eaa84a6a8652
font_02_sfnt_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 16076 bytes
SHA-256: bfd5fcdb7495bed175e4f51938194e2ecb7e505d90535bc2124716332a04a4ab
font_03_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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