Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be67e4a7a5e57f3…

MALICIOUS

PDF

110.1 KB Created: 2021-04-17 11:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c539e2a55304bb45a30d0d230c5d7c42 SHA-1: 6ff4e4f4a105d520951bd63dc576d4ba9aef591a SHA-256: 8be67e4a7a5e57f37ed2e44495bdd9fa3765b25d053f395fbaa18792c301263e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'kuzutuzo.ru' which appears to be part of a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=best+graphics+card+for+dell+optiplex+gx620
    • https://bafuvigugasud.weebly.com/uploads/1/3/5/3/135308410/gogibik.pdf
    • https://cdn-cms.f-static.net/uploads/4389074/normal_5fd852256149c.pdf
    • https://cdn-cms.f-static.net/uploads/4407066/normal_5fd7bf9f38343.pdf
    • https://maxanulimaxufu.weebly.com/uploads/1/3/4/5/134585670/fakerasuvapive.pdf
    • https://cdn-cms.f-static.net/uploads/4421039/normal_600d241f36d7f.pdf
    • https://cdn-cms.f-static.net/uploads/4467564/normal_60318ffda472b.pdf
    • https://cdn-cms.f-static.net/uploads/4471691/normal_6056d51d2af4b.pdf
    • https://rabidibizuzej.weebly.com/uploads/1/3/4/6/134648686/rimes.pdf
    • https://makirogu.weebly.com/uploads/1/3/0/9/130969002/bixaxajapogagaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_cc24cc2e1eea478b94d7a377984bb99f.pdf?index=true
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_d201744ce07f4ef6bf18fefa2edd7b8b.pdf?index=true
    • https://s3.amazonaws.com/pusixa/word_puzzle_worksheets_5th_grade.pdf
    • https://s3.amazonaws.com/vaxebisapesi/92074870349.pdf
    • https://uploads.strikinglycdn.com/files/4764d5ba-24cb-46d8-8ff2-45470a6158ac/panasonic_dect_kx-tgc210fxb.pdf
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_02cc0af35cd64b10ae5a7d8167ec7c32.pdf?index=true
    • https://s3.amazonaws.com/ninasivol/65054448765.pdf
    • https://s3.amazonaws.com/rufonali/printable_pre_algebra_worksheets_for_7th_graders.pdf
    • https://s3.amazonaws.com/zoxewudunigus/japuxikoruwofen.pdf
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_ddcb9bc2f5bd404bbabcbdb7b31b9ce2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fa57e81c-7e69-4a85-8d39-118d0162914f/how_to_draw_faces_beginners.pdf
    • http://support.dell.com/support/edocs/systems/opgx620/en/ug/a02/tools00.htm#wp1114558
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001586e.bin
aedda860bea3acecff924bc6af68b3aef95381d0b9b0b5c766a0a50bd694fe48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1586E 5964 bytes
font_01_sfnt_off00016cc1.bin
87445ac8ff49b1ae83b6e0a87ad7644ab93550e270f24a5e57b63c3c726c4b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC1 11588 bytes
font_02_sfnt_off00019492.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19492 16204 bytes

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