Malicious PDF — malware analysis report

Static analysis result for SHA-256 86921e44f4a15837…

MALICIOUS

PDF

79.1 KB Created: 2021-01-06 16:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88ec27a7d3daa1c2dfa5ceee1831338f SHA-1: 13c1d00bbf5d71f590e1b4e45d80289c05455a4a SHA-256: 86921e44f4a15837c62d2a450496880d678fa98e89543c2f3a522875a7d710b1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on file-sharing services like Weebly and S3, suggesting a link farm or redirection mechanism. The primary URL observed is `https://trafficel.ru/123?utm_term=five+senses+impact+perception`, which likely serves as an entry point to this network of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=five+senses+impact+perception
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/722919.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/71b9fa8eeb5a7f.pdf
    • https://static.s123-cdn-static.com/uploads/4419452/normal_5fe2881d2a44d.pdf
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5ff507350cf1d.pdf
    • https://zimolitavok.weebly.com/uploads/1/3/1/8/131856331/5213296.pdf
    • https://gikositaga.weebly.com/uploads/1/3/4/7/134773380/tidoxiwudasuv.pdf
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/f1163f3128.pdf
    • https://cdn-cms.f-static.net/uploads/4393356/normal_5f966dc34d2e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitizobuv/video_converter_mkv_to_mp4.pdf
    • https://s3.amazonaws.com/juliziwojatige/simple_math_worksheets_for_preschoolers.pdf
    • https://s3.amazonaws.com/zafirawit/pinavojumuwanonezigaw.pdf
    • https://s3.amazonaws.com/guwutivupudutu/elite_platinum_pressure_cooker_manual_10_qt.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_off0000fbc0.bin
a4e224893546e9927005c13b3c684422c5e93803a02eaeb0eefa73c97c29fee1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 5060 bytes
font_01_sfnt_off00010ce5.bin
82bfd6d4e0a9cd07c6f4c0c3086b94f71295d0f19603ce10034683e8a686d5e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 10356 bytes