Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a6cda0ea9102d2…

MALICIOUS

PDF

85.0 KB Created: 2021-01-14 01:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 59e9c3e0b43af0ebe4b3a7ce2115e613 SHA-1: ac94604e64962874b4a3d40d834aa5b505001c6b SHA-256: a6a6cda0ea9102d207daf330232aca7f74f1e49c3b3e2d91a5ed6092349ad4db
204 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains a link farm with numerous external PDF links, including one pointing to 'trafffe.ru', suggesting an attempt to obscure malicious content. The document body, though truncated, contains keywords related to free software cracks, reinforcing the phishing pretext. The presence of a 'password-protected archive handoff' heuristic indicates a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=bookworm+adventures+free++full+version+crack PDF link annotation
    • https://site-1236009.mozfiles.com/files/1236009/climby_hammer_pc.pdfIn PDF document text
    • https://site-1177566.mozfiles.com/files/1177566/22249112695.pdfIn PDF document text
    • https://site-1168049.mozfiles.com/files/1168049/hockey_montreal_elite_midget_aa.pdfIn PDF document text
    • https://wanuwoziburake.weebly.com/uploads/1/3/4/4/134458428/fetenod_kikipavitan.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/d8fjggh/free_superhero_coloring_pages_for_preschoolers.pdfIn PDF document text
    • https://cdn.sqhk.co/xusovatovu/SKhdjbq/todoist_mac_calendar_integration.pdfIn PDF document text
    • https://site-1177442.mozfiles.com/files/1177442/155182542.pdfIn PDF document text
    • https://site-1228403.mozfiles.com/files/1228403/xeboxasagibufutu.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/nerugiraxura/27467525053.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/51645856166.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/formal_graduation_invitation_letter_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/sample_personal_monthly_budget_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/57455258693.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/free_templates_for_joomla_website.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/kesegapanafipek.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_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 5432 bytes
SHA-256: df2ca28b7c92ccc2efe4115a29747a5c6db8e2933395d06a640cd307bc64c22b
font_01_sfnt_off00011f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F86 11428 bytes
SHA-256: c3788310c8d129c3a2e3d96e1f3e2efc175664ae9f5cb8c22c90c9346af9b590

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