Malicious PDF — malware analysis report

Static analysis result for SHA-256 2373a261e8b19cf8…

MALICIOUS

PDF

66.2 KB Created: 2020-11-25 12:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce86004c1e15e6a23b78e2cbe7c73a14 SHA-1: 12bdd4e05086534f66b1471d0ea41aa4f86b6e81 SHA-256: 2373a261e8b19cf8f6fe47556bda9b36941864962648a43ba2b94ebc0b7d60c4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains numerous external links, with one pointing to 'trafffe.ru', suggesting a link farm or redirection to malicious content. The presence of PDF_SEO_LINK_FARM heuristic indicates an attempt to generate traffic or distribute content through a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=neb+form+2075
    • https://xemojunaxumig.weebly.com/uploads/1/3/4/2/134265853/garaxexuzekupis-mubir.pdf
    • https://radelemetiwiwi.weebly.com/uploads/1/3/4/5/134520029/robobozevetelole.pdf
    • https://surafevigenirax.weebly.com/uploads/1/3/4/6/134610600/4413014.pdf
    • https://josilagowuf.weebly.com/uploads/1/3/4/0/134018629/7b4465260a9.pdf
    • https://lufavipipoj.weebly.com/uploads/1/3/4/5/134580953/garara.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/183ef131-bf5c-4f8b-ba0c-c01cb51ef994/uceusa_exam_answers.pdf
    • https://s3.amazonaws.com/somamere/personal_assets_and_liabilities_template_excel.pdf
    • https://s3.amazonaws.com/vibasujefir/vowel_digraphs_worksheets_grade_2.pdf
    • https://s3.amazonaws.com/fekazudabo/13029850797.pdf
    • https://s3.amazonaws.com/joterige/lekenitezexefakuz.pdf
    • https://uploads.strikinglycdn.com/files/c9b0ab64-6af5-4145-9131-27a958264949/overwatch_aimbot_free_pc.pdf
    • https://uploads.strikinglycdn.com/files/1e2d0c75-cc7e-46f8-888f-250616435740/street_fighter_alpha_2_stages.pdf
    • 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_off0000b1b7.bin
b11f3e6be9d772e53975b28839ab69d9eddd468483fae8249ab07160854019bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B7 5080 bytes
font_01_sfnt_off0000c305.bin
76f6bb4b15fba2b962426ff53d1ee95a9aed06536ee2e3737b0a61dad5d64bae
pdf-font-stream PDF embedded font (sfnt) at offset 0xC305 10648 bytes
font_02_sfnt_off0000e74b.bin
3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 16164 bytes