Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd63a2f94f5607d…

MALICIOUS

PDF

67.8 KB Created: 2020-12-20 20:26:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc1193537e1cde2010ab7ebbb0fe0ff8 SHA-1: da3a0b2ed05bfe027279d897933d05fbef92ffda SHA-256: 1cd63a2f94f5607daca05eaba8d433163199b3edc660d6afb5d08d3fe20e0380
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The document body, though obfuscated, suggests a pretext of an 'internal assessment' to lure users to malicious URLs. The presence of embedded links and the overall structure strongly indicate a phishing or malicious redirection attempt.

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://traffine.ru/strik?utm_term=information+technology+in+a+global+society+internal+assessment
    • https://cdn-cms.f-static.net/uploads/4410988/normal_5fb47f3248354.pdf
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5f9193df73551.pdf
    • https://cdn-cms.f-static.net/uploads/4486192/normal_5fd8de7f01eee.pdf
    • https://pupedabakonarow.weebly.com/uploads/1/3/4/7/134709410/zezorotoximanab.pdf
    • https://fonamajubeb.weebly.com/uploads/1/3/4/4/134474676/bafetoxumu.pdf
    • https://gixajukixopa.weebly.com/uploads/1/3/4/8/134877082/pazagorekoj.pdf
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fa5601a426e4.pdf
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f893153d77da.pdf
    • https://cdn-cms.f-static.net/uploads/4388062/normal_5fb90d2734d9a.pdf
    • https://cdn-cms.f-static.net/uploads/4424689/normal_5fb38a8e32e07.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/20b441de-d405-47d6-866c-d41eb6c2768b/nezudafubujetirivaxuwupo.pdf
    • https://uploads.strikinglycdn.com/files/8bcb1194-9500-4197-9aa8-3655bfb379c6/cay_mang_cau_do_thai.pdf
    • https://static1.squarespace.com/static/5fc1ae857d0c8f249d464d7c/t/5fcc30d07ae85b53b2834127/1607217360333/dolil.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_off0000c825.bin
c442105f9e3e4e06b6adaf5fe28559d8bfee551ec1f6695c13ab96ff4a94a3cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xC825 5472 bytes
font_01_sfnt_off0000daa4.bin
7dc27a85037505e176732b33fea8e9d9d8f9e4c5e88d5dd8a917d75ceefffe10
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 10992 bytes