Malicious PDF — malware analysis report

Static analysis result for SHA-256 805ed79ef084f0ad…

MALICIOUS

PDF

70.7 KB Created: 2021-01-13 23:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e8bd671735b967efd5b5aaf4ad08fa31 SHA-1: ab4292ab1ebd8481c219805324b98d8ae33d3a9a SHA-256: 805ed79ef084f0ad032610252d659c2ca47a77dd6fc2c698211a229ad25623eb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for phishing or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'Cub cadet sltx 1054 repair manual', which is likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=cub+cadet+sltx+1054+repair+manual PDF link annotation
    • https://site-1175236.mozfiles.com/files/1175236/83076992536.pdfIn PDF document text
    • https://cdn.sqhk.co/misumirotoj/jbJChbm/snakes_and_ladders_board_games.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/jhbvwQ8/jadubojemexok.pdfIn PDF document text
    • https://rupunapu.weebly.com/uploads/1/3/4/3/134354814/5074591.pdfIn PDF document text
    • https://toxafowusolele.weebly.com/uploads/1/3/2/8/132815148/fijulenax_dezojiboxari.pdfIn PDF document text
    • https://site-1173572.mozfiles.com/files/1173572/galaxy_watch_2.pdfIn PDF document text
    • https://site-1168429.mozfiles.com/files/1168429/free_robux_for_roblox_cheats_and_guide_app.pdfIn PDF document text
    • https://site-1083678.mozfiles.com/files/1083678/63088578275.pdfIn PDF document text
    • https://site-1206392.mozfiles.com/files/1206392/29365702977.pdfIn PDF document text
    • https://site-1177754.mozfiles.com/files/1177754/drag_racing_games_for_android_free_download.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/debiwelof/36611400104.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/pubitakodoladaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/jusebumusanesatujibik.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/zefegimunabenelim.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/41820010837.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/free_marketing_plan_template_nz.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_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 5736 bytes
SHA-256: a10855a43b552844205c4861702b42e72163d3a3f65f8ad5026ad731d4114785
font_01_sfnt_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 10680 bytes
SHA-256: 5b6bbdb3e8b86fb40a2438b252054984029f8502deb8faa8b30403e2d47b7941

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