Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67929221202e955…

MALICIOUS

PDF

68.7 KB Created: 2020-11-25 00:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26e4b6cf1273fb8aed1f1d202eea2349 SHA-1: 14416765899b757e58122aefa2de8917afd98bc9 SHA-256: b67929221202e955fb4fa1cf09dd5b19edc6fe595d3c3c1c889fb644c2dc97d0
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trafficel.ru/123?utm_term=ark+extinction+map
    • https://vetaneje.weebly.com/uploads/1/3/4/7/134729364/3360890.pdf
    • https://xamegazu.weebly.com/uploads/1/3/4/4/134440804/5326523.pdf
    • https://suzokapiwewop.weebly.com/uploads/1/3/4/3/134351383/b2f155513ac85b7.pdf
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5fa1517db622c.pdf
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f90d1f225567.pdf
    • https://kulirudezu.weebly.com/uploads/1/3/4/5/134583820/6137432.pdf
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5f9449eee241d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/woxorojero/66538754621.pdf
    • https://s3.amazonaws.com/widiku/demowopoluvoxisabafifuwog.pdf
    • https://s3.amazonaws.com/jewizopukuni/tumiwuxalorovosuxa.pdf
    • https://s3.amazonaws.com/gulapore/bedumozakup.pdf
    • https://s3.amazonaws.com/wajibile/best_video_player_android_chromecast.pdf
    • https://s3.amazonaws.com/degisapemifa/physics_kinematics_worksheet.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_off0000d1ef.bin
2e33017fd66487e65fde777336920b94121349c3a7c2598e888422c865d2d3f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 4988 bytes
font_01_sfnt_off0000e2d6.bin
f3933ea645b5bbd3d026fa2fb8a861663e207bfb6d64fc6b356a4c5628e9b675
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 10340 bytes