Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d57f5e5a3d851c…

MALICIOUS

PDF

79.4 KB Created: 2020-12-07 20:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5f8959610730a2bea879596cd4df6a7c SHA-1: db3e69841de639762cd123497593fa160bebc22f SHA-256: 80d57f5e5a3d851c4a6e448ebd6afa81bde5b2c853faea793f009ab3d9192cb5
156 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 embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafficel.ru/123?utm_term=mega+man+8+grenade+man PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5fb611f707bd5.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/bexilibizixeba.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/wulagisi/bfa_alchemy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/blood_letter_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69841187-21fa-4589-a0e9-e30c400d7560/97959208709.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/bilinear_forms_linear_algebra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997f6651-a8fd-40b9-986e-c3dcf73a0919/quadrilateral_properties_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/bluestacks_free_for_windows_8._1_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff25b096-14d4-4b29-b1b9-9ec39d41ff70/no_man_s_sky_portal_interference_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/kixozixagudekuzixopavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f843dc-3807-41a2-bda8-0fe087cd80cc/check_safeway_gift_card_balance.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC728 16380 bytes
SHA-256: 29463688ac792ad7825d980140a914c5d288c98c03eb6476de79ad8c27993bc8
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 5136 bytes
SHA-256: a47cc8c1db0be625afe91955fae15a06b769d3b95bc427a00460fed87bc3fb7f
font_02_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 10492 bytes
SHA-256: 43b968fb673e4f20b91a3ff6c9fa25f052350075f03e33f8ed7d8b69540976de

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