Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f9a4c777395ddc…

MALICIOUS

PDF

69.1 KB Created: 2020-12-30 15:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3ac21a0790bb4e73086510156c931fa SHA-1: 13f5b9cb6daef23397717bd30e600dd44a29f36b SHA-256: 92f9a4c777395ddc917f04f56538516dc39592e710fe421c01b7767b5c72c636
164 Risk Score

Malware Insights

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

The PDF contains a high number of external links, flagged as a link farm, and a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external links and the phishing/trojan detection suggest an attempt to redirect the user to malicious content or exploit vulnerabilities. The document body's content is largely unreadable due to truncation and encoding issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffset.ru/strik?utm_term=hide+your+pain+harold+thumbs+up
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/zidelopeni.pdf
    • https://dagolitufewanat.weebly.com/uploads/1/3/5/3/135345669/xibiropojonuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/povodijirig/cdpo_exam_syllabus.pdf
    • https://s3.amazonaws.com/wusone/fedipenijedupujusuri.pdf
    • https://s3.amazonaws.com/lanaladu/asking_and_giving_directions_exercise_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/c0694ec9-f480-4c91-a9e6-bff5b28a9347/27686880183.pdf
    • https://s3.amazonaws.com/sorogamat/gomal_university_date_sheet_2019.pdf
    • https://s3.amazonaws.com/polojuliragam/xemirezulekene.pdf
    • https://s3.amazonaws.com/baxunaf/76144374484.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d20e.bin
57f8b5cc52691bb1c9d6fbe7d2e40d3902222600f45ca4de62f87c30fc535473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 5404 bytes
font_01_sfnt_off0000e43a.bin
e84f3c541f1850ef56a443ef9a998833663a924a04602e5dc2fd7d28a8b74e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 10840 bytes

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