Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca681839024689f7…

MALICIOUS

PDF

68.6 KB Created: 2020-12-23 14:18:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 23185181dbd15806820e6ecff9b9f219 SHA-1: dc9fac6177bffdfae6526c56fe5fea2cffa5ca36 SHA-256: ca681839024689f745ac87d107218af4cda80f949586aed6f8ec0010648728b8
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. 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 0.9974

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
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://setinedib.weebly.com/uploads/1/3/4/6/134684411/5261923.pdf.
  • 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://cctraff.ru/strik?utm_term=frndly+tv+hallmark In PDF document text
    • https://setinedib.weebly.com/uploads/1/3/4/6/134684411/5261923.pdfIn PDF document text
    • https://maxanulimaxufu.weebly.com/uploads/1/3/4/5/134585670/tesivilopoperekidov.pdfIn PDF document text
    • https://nozesebekujizaj.weebly.com/uploads/1/3/4/6/134698307/7e753d516e677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492257/normal_5fb76d9fea52b.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/tetazino/wafatakajuvuvopipunija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d647bced-ca85-46ea-90f0-0704d5191554/44348819934.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/90781558602.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/ghs_staff_directory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1292df7d-00fc-4c37-b105-28827eb423a1/63979641927.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_off0000cde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE7 5068 bytes
SHA-256: 86bc57c65fa9499e6471add5d7ced7b4d8f520a02ab5f1845cef878c5c85c348
font_01_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 11572 bytes
SHA-256: 698d74a36c61a93a2bf33676a2d3a496994f2ea19919d2868130bbc305d406ee

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