Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77a296de1d879ac…

MALICIOUS

PDF

66.0 KB Created: 2020-11-11 19:26:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: dd7c08972d49a065ce69afe663583059 SHA-1: 277377c9e051b4e7b964596e6554a9f9116577af SHA-256: c77a296de1d879ac8cb9550780607c0bd64e5cd80f89e837a00e8e3ba0104d90
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 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=hyperburner+apk+uptodown In PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/tugosuweref.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5f9b7cb3cf610.pdfIn PDF document text
    • https://ligexomapaku.weebly.com/uploads/1/3/4/3/134321337/velelevofaguf.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/vamodapipasinipiton.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_5f989b31b4794.pdfIn PDF document text
    • https://gumarifubora.weebly.com/uploads/1/3/4/4/134465571/berovuvifiwakabupise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f95b320b7cde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5f94145c0ef83.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/henghuili-files2/bipugij.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/cheating_prank_text.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/biology_cells_word_search_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/28699727805.pdfIn PDF document text
    • https://s3.amazonaws.com/jevuxozazebazug/physics_11_projectile_motion_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ab3b98-38a6-4965-a5d3-edf1dfa1a535/dymo_letratag_qx50_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8565cf5a-e29a-463e-9f4e-264de20de391/tunogopujujikiterogaji.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_off0000c394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC394 5104 bytes
SHA-256: 8ea8d9bc61c711bc63e0e233dbee90b70f191abd92195ba786a5cc53008c048d
font_01_sfnt_off0000d50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 11132 bytes
SHA-256: 78601f687feed780a9c3a919bcc2bbf90c78d33033d846706a7babb64431a8ea

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