Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1a0f09ef3491c6…

MALICIOUS

PDF

67.5 KB Created: 2020-12-13 15:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e6096c14c6b75426b1f48340b31b29f7 SHA-1: 501cde6740bac4fc3d900c83dbe01bd12dd8bb6e SHA-256: bb1a0f09ef3491c6b25d0d50e21440193cf4d773a49951aca2fd16cccd7f11b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a link farm designed to direct users to other PDFs. One prominent URL, 'https://trafffe.ru/wb?keyword=adobe%20reader%20software%20%20for%20laptop', suggests a lure for software downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/wb?keyword=adobe%20reader%20software%20%20for%20laptop PDF link annotation
    • https://rugotegejobaxus.weebly.com/uploads/1/3/4/7/134734811/belodawu-jimewoluwa.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/1813903.pdfIn PDF document text
    • https://retuxuzuj.weebly.com/uploads/1/3/4/6/134688644/fefexaw.pdfIn PDF document text
    • https://nomumiti.weebly.com/uploads/1/3/4/3/134330837/c9043c2eadc.pdfIn PDF document text
    • https://sekamaxe.weebly.com/uploads/1/3/4/5/134590712/8636197.pdfIn PDF document text
    • https://zitokafinug.weebly.com/uploads/1/3/4/7/134738680/4734633.pdfIn PDF document text
    • https://fisokupavunimi.weebly.com/uploads/1/3/4/4/134469682/lukomep.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/kovozenamofox/mujitisowegajuzo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eb456b97992eb55c2a22/t/5fcd84cee43f2b00a8c048a5/1607304398828/40844929722.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e01f2cf09257bd6be9c2/t/5fc1e7657acac6192a05c63b/1606543206158/80857763686.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5acd3485235c86bdb1d5/1606376141241/cracking_the_pm_interview_epub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9af0ca7-2eb8-4066-8c31-33b4a191238c/hetaida_technology_htd8813c.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/maths_puzzle_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/suzeduselu/instep_safari_double_jogging_stroller_blue.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b3865fa98a681f101f83/t/5fcc97115177ea328cbcbf9d/1607243544852/70450225634.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1559bc6d9645836252c59/t/5fc35e53f81c9a2a0c0d3dcf/1606639187475/65340671739.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_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 5256 bytes
SHA-256: a972857708addcc8cfb3079da68e470a64d546dc349d743fddacf665b525bed2
font_01_sfnt_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 10544 bytes
SHA-256: 5c2124a71dbe395ca263e210c8e8f47b937702dadbed78c03afc4ecacc4bca99

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