Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c83376544608cd…

MALICIOUS

PDF

67.7 KB Created: 2020-12-20 10:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4ee616ed0a4ee10abc68048906c8da20 SHA-1: 9e7dd35ece72037b5fbbd927197e6beac1507fb9 SHA-256: 04c83376544608cd373f6a4053c91e08e2bb34f41713de3d92e68ea2cc50affe
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to what appears to be a link farm designed to mimic search results for academic content. One prominent URL, 'https://traffking.ru/strik?utm_term=engineering+mathematics+stroud+8th+edition+pdf', suggests a lure related to educational materials. The presence of a large number of external links, including a link farm heuristic, indicates a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/strik?utm_term=engineering+mathematics+stroud+8th+edition+pdf PDF link annotation
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/702575.pdfIn PDF document text
    • https://duxawedi.weebly.com/uploads/1/3/4/4/134477895/lenozo.pdfIn PDF document text
    • https://fatononatigomun.weebly.com/uploads/1/3/4/8/134846471/xipefawuj.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/4461080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_5fa745f4b5dc2.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/dojonuta/latamefepivozofujeve.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/the_boondocks_season_3_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/solving_quadratic_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/bts_run_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/pafotenubob.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc514788ef7301f8b2bec82/t/5fc84eab970db930d9bc7e01/1606962859165/high_speed_pinball_machine_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/the_closer_s_survival_guide.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_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 5688 bytes
SHA-256: 985a1b5cb5dfbd5417eb337500e8ee12e5a1228139646e3f5cf33e6639b59098
font_01_sfnt_off0000dd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD31 10756 bytes
SHA-256: 1c7bc52c1f05b358321aa6b154dfd74488c68db0bb82e09bd62bbada9b17e1a0

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