Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cbce4ac5c924d6…

MALICIOUS

PDF

67.0 KB Created: 2020-11-24 03:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 129c4292083db39c34df1691cf38972d SHA-1: 98bc573997247a579171dec77a7dbceb770699e1 SHA-256: c5cbce4ac5c924d66671b47bfeb56ae927a4dce10b3b59ef09282b64f65be8c7
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-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/strik?utm_term=composition+paper+css+2000 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_5f963ae5f3300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_5fbb4e2db04c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480580/normal_5fba03a7c1b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_5fb340046da3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f8c1fe4c24ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_5fae053c93aa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422643/normal_5f9b6111035b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_5f90f8f2b37f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408324/normal_5f9ac73c103e1.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/fomaralunex/cleric_life_domain_gods_5e.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/information_technology_meaning_and_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/siwiraguboxewi.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/sopizupanutepetatuk.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_off0000c8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FF 5224 bytes
SHA-256: 043808a65e595db11c4c3517d2e8e6df7f73ec66a6dae84ce50f41661136b68f
font_01_sfnt_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 10940 bytes
SHA-256: 1e6680329665477ab93d28825e2faa12cdd20ac82513d7a9027f1a31adb7d500

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