Malicious PDF — malware analysis report

Static analysis result for SHA-256 73165faa7619ba1e…

MALICIOUS

PDF

66.1 KB Created: 2020-12-26 05:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c0b9cccda3fcb70cc538a07bdf67e1c7 SHA-1: 77ec9e12fe577c5220728d88a3109b977146ecab SHA-256: 73165faa7619ba1e96a41d001c50ebdc8758fcbf23dcc8770da614af9189c921
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to artificially boost search engine rankings. One of the external links points to 'https://trafficel.ru/strik?utm_term=battle+royale+wallpaper+download', which is likely a phishing or malware distribution URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/strik?utm_term=battle+royale+wallpaper+download PDF link annotation
    • https://cdn.sqhk.co/zenetofuma/aqtjfja/t_rex_chrome_dinosaur_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453118/normal_5fa01108ed051.pdfIn PDF document text
    • https://fitijozis.weebly.com/uploads/1/3/4/3/134372299/sepelapitutiw_debofi_buwoger_pakir.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/a7405e2b5148652.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/pozokimepe/fredbear_jumpscare_fnaf_ucn.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/math_worksheets_algebra_word_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/71806817286.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/66418383293.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/zodoxotetosewopataximorus.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/cambridge_checkpoint_science_workbook_1_answers.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_off0000c3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A1 5016 bytes
SHA-256: 9d6af93b4e8e76f62b1853729560fed2d3d86d9d122ee2e5b56dc3ee5c4a23dd
font_01_sfnt_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 12068 bytes
SHA-256: 8681397550f3c136adf7b79198d10055254d9d63366a4950e90bbf2fd4c6b2bf

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