Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d3d6e6c52d86d5…

MALICIOUS

PDF

71.7 KB Created: 2020-12-29 12:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7054c7681a1c83e7e61617da594c30dc SHA-1: 90280d6f53fcc0d7d0aad9dfe119c607b5e4eda4 SHA-256: 77d3d6e6c52d86d5e5941d032eb4a9c87805157c7762e1ba85b9ada236c10f95
176 Risk Score

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. It uses a callback-phone (TOAD) lure. 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 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafffe.ru/strik?utm_term=off+road+v8+race+buggies+for+sale PDF link annotation
    • https://cdn.sqhk.co/marixefe/yhhhfjh/ai_programming_with_python_course_drives.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/jIgiwKP/msi_afterburner_beta_or_normal.pdfIn PDF document text
    • https://cdn.sqhk.co/fabupiguboxa/ggyLyih/kamivuxufer.pdfIn PDF document text
    • https://cdn.sqhk.co/fewisezux/jaZWiJW/17280166353.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvotalek/gjja1hf/89836539516.pdfIn PDF document text
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/gidatizogodobiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/72640303626.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/2002_saturn_vue_manual_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/gantt_chart_template_for_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/searching_for_sugar_man_album_free.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/24924268204.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/86679158327.pdfIn PDF document text
    • https://s3.amazonaws.com/wisatutadi/92915236745.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_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 5308 bytes
SHA-256: f1f69758d8f4bbbbf95dc7b9b8ba38562e73434f2e7607cadd4e6d017253769a
font_01_sfnt_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 10412 bytes
SHA-256: 19269b5b760844d07fa06729cbffb38b1a0fd1de2a922c5d63bfdfccb4ab528f
font_02_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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