Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b21be357a5f0d0c…

MALICIOUS

PDF

67.9 KB Created: 2021-01-14 13:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cd2192886cf960a7f3e801e0d22e5ff4 SHA-1: 00c0a955adc3e1ba6b4191da6d5c990f34c9f4a6 SHA-256: 9b21be357a5f0d0c08175b61c48beccf9f1eefeeae56295435d8e83bf1bfd91b
244 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a link to 'traffmen.ru' and the overall structure strongly suggest a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF's nature and the heuristic firings point towards malicious redirection, likely leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=mathematical+olympiad+treasures+pdf In PDF document text
    • https://xafovudomogagak.weebly.com/uploads/1/3/5/3/135324285/1677043.pdfIn PDF document text
    • https://tuzibexidove.weebly.com/uploads/1/3/4/8/134852131/c4d2ca06b.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/agjhija/pulse_secure_network_error_1329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_5fab5f8ed6930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474220/normal_5fd1c2b0644bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f8b0ddaae452.pdfIn PDF document text
    • https://fisegumatiwal.weebly.com/uploads/1/3/4/7/134722042/eed594d7a0d159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471095/normal_5fc494365b53e.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/TPjhhhM/knives_iowa_city_iowa_zip_code.pdfIn PDF document text
    • https://golosoruxo.weebly.com/uploads/1/3/4/3/134339442/7945617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_5fdacb935a3d7.pdfIn PDF document text
    • https://buzelobuledu.weebly.com/uploads/1/3/1/3/131397981/roxuselogije-feven.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC84 5500 bytes
SHA-256: 6cc8323facdcc9143816162dac63bd0acc0c26672c396cd38188f43b4ae03aac
font_01_sfnt_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 10540 bytes
SHA-256: 344e3d29357171913701809ec162f3e8dd81aaa9140c0ce54fc6b408805cfda4

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