Malicious PDF — malware analysis report

Static analysis result for SHA-256 641a90739073c0b4…

MALICIOUS

PDF

57.7 KB Created: 2020-11-10 06:34:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b3875d87d3bb17c825e0b999d5b13d27 SHA-1: 28ee014d01fb8c6c66863f79dad2558f4389bc31 SHA-256: 641a90739073c0b47f05b97156399bc39f2aa67cd2cbaf7cb2defd2c1e8bca7e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://gettraff.ru/123?keyword=noodle+st+in+fullerton+ca In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5f8f621139cd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_5f98e3b50f5dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5f8eb7361ca8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2fdcfac-e888-4d12-bdf3-a05988385f30/beauty_and_the_beast_violin_sheet_mu.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/cause_and_effect_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/24012205589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb72cb8-a7f7-4f9f-b693-5b724466a586/navy_cyber_awareness_challenge_2020_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0685f579-9be3-4beb-9ae3-a53d2ac37bd6/50116372597.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/54879505671.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/fernbus_simulator_steam_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1daf67-45f4-4ccb-a615-9f3c82a42f29/introduccion_a_la_seguridad_informat.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/23483011087.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_off0000a9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9B3 4984 bytes
SHA-256: d9c4b909a6ce4bf565c5a2f6571d6e8ef0bb8806a541a42fc080ff27b0be78b8
font_01_sfnt_off0000bab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB6 9376 bytes
SHA-256: 8cf3a21f42d686503538aa9316ea9957e652cbea6769875cb73478b7224ac003

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