Malicious PDF — malware analysis report

Static analysis result for SHA-256 582b85928e6712c2…

MALICIOUS

PDF

116.1 KB Created: 2021-03-18 15:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 960dd1265b4e03296757ddda175c4461 SHA-1: eb1bbd004e097af068334a1c6e2f05ef4a52d84a SHA-256: 582b85928e6712c2d7b3b7c7c384f756f5686027292bef28c6b6f8187950a738
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or redirection mechanism. The primary malicious URL identified is vilenefex.ru, which is likely used to host phishing content or distribute further malware. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=genetically+modified+food+journal+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375194/normal_602c6289625e6.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/7880008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403266/normal_5fe2949ba1555.pdfIn PDF document text
    • https://cdn.sqhk.co/kajemuwasutu/o6GtX3S/kupifipeduwobajin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_6025064e7eb59.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/Mignhhe/harvard_referencing_guide_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/feduminaro/jf2zuna/sawikain_worksheets_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/hadOYxc/betefuban.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/5394470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483864/normal_602fa72fae1e2.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/makixibawumebol/maths_question_answer_app.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/xobofikajimaloki.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/58003732407.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/water_apple_tree_images.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/apush_chapter_13_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/pufiritatilibewitike.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/muxugadilagaketitemamunet.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/self_certification_form_template_nhs.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/slope_intercept_form_given_2_points_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/tower_of_nero_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/dojob.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_off00018945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18945 5332 bytes
SHA-256: 99e3a94eae26305f8127e8b6fd9386fed7492dc174f29cb13299d04590423920
font_01_sfnt_off00019b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B67 11812 bytes
SHA-256: 2ae73f971347abe6e0f767debbffa050baf2f44538c6100b6dd6fb7301dc321e

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