Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b42272b2b980ac7…

MALICIOUS

PDF

66.4 KB Created: 2021-01-11 03:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: eef2b0e1dab2086e4d5dda91d5b51a71 SHA-1: c50e0d7728c734b811f6bcbd2097766d5eebab52 SHA-256: 6b42272b2b980ac717f9ea8013076a9188c9002749686f1234604284a360b676
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to S3 buckets, which is indicative of a link farm or SEO abuse tactic. One of the primary URLs, 'https://traffking.ru/123?utm_term=mechanical+and+chemical+digestion+examples', is flagged as suspicious. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffking.ru/123?utm_term=mechanical+and+chemical+digestion+examples PDF link annotation
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/114557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_5fdaebe537589.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/jodabiladezot/insert_sheet_name_in_excel_vba.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/15173015438.pdfIn PDF document text
    • https://s3.amazonaws.com/xukidosifixi/free_haynes_manual_online.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/tulezan.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/jofaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/case_files_family_medicine_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/linux_mint_19_cinnamon_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/words_with_ab.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/current_liabilities_included_in_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/weduvila.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_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 5464 bytes
SHA-256: 189de02e69daebdaf8415079b7d5a38548a09ee1271fc22669e95387d9ddf795
font_01_sfnt_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 9944 bytes
SHA-256: ac17dfbe940a4fda931b7d9df70a19f5a64939b6a46b431540869de2b6ba0e5c