Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c498e100cee929…

MALICIOUS

PDF

67.8 KB Created: 2020-12-18 00:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ee6a2f081f6d8c9748efe6c5d043fb4 SHA-1: 33f276e1ce16993c6af700d848cec8c32810a895 SHA-256: b0c498e100cee9298c67d8f8f827275d8dd03f193beab6d516bcd5caaa00b306
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is designed as a link farm, likely to facilitate phishing attacks or distribute further malware. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/123?utm_term=coming+of+age+sex+films
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5fd2bfba53211.pdf
    • https://vomagorawu.weebly.com/uploads/1/3/4/7/134720662/9161525.pdf
    • https://cdn-cms.f-static.net/uploads/4465709/normal_5fb2bcd0203af.pdf
    • https://cdn-cms.f-static.net/uploads/4376850/normal_5fd0e60a397f2.pdf
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/pefuxenupura_lakonaxesup_vudafe_pilomovowudo.pdf
    • https://cdn-cms.f-static.net/uploads/4388416/normal_5fc0a04fd9b59.pdf
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f881f6c1b7a5.pdf
    • https://cdn-cms.f-static.net/uploads/4389809/normal_5faf89b8068a8.pdf
    • https://dudatagavadupim.weebly.com/uploads/1/3/4/4/134402573/buturigadegiwok_vanubidovazelit_rideriv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc2c69c88c99b6d37b36994/t/5fc8ee8d1dc2957330f93b2a/1607003789637/23808792988.pdf
    • https://static1.squarespace.com/static/5fc0ce8ac6d964583621afbb/t/5fcc13c93ff1011540df326b/1607209929959/strike_fortress_box_battle_royale_online.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_off0000cf3e.bin
289a54e08d6c1041f45beac49ccddb11b8aaba5abc4915e9e40d097b0cf48a89
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 4964 bytes
font_01_sfnt_off0000e01e.bin
7873454f98b2a452ad54f9081d692d01f66fbb1bbb0d15f58c67dce490020979
pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 10184 bytes