Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d36808148bce99…

MALICIOUS

PDF

127.3 KB Created: 2020-11-14 18:54:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbe3a7476008cd6a7383c499527fab66 SHA-1: 5dcc2f726c69ee9a845368c750272bf54008fca6 SHA-256: 83d36808148bce99e74ede468deadd2e92bf016083906d19fe4a73c2e31d803b
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The primary URL identified, 'https://cctraff.ru/strik?utm_term=dreamweaver+templates+responsive', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains keywords related to web design templates, suggesting a lure to attract users to malicious sites for potential phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/strik?utm_term=dreamweaver+templates+responsive
    • https://cdn-cms.f-static.net/uploads/4413373/normal_5fad5206886f3.pdf
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5fa2fc0e96f83.pdf
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5f8a2a43bec21.pdf
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f943a730b3ee.pdf
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f8960090763c.pdf
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f8cf44d3c697.pdf
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5fabdb7be727e.pdf
    • https://cdn-cms.f-static.net/uploads/4458827/normal_5fae1252eab4f.pdf
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5f98adea80e2a.pdf
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f970c6a50aff.pdf
    • https://cdn-cms.f-static.net/uploads/4388627/normal_5fae71ba51209.pdf
    • https://fepirajoruvizu.weebly.com/uploads/1/3/4/3/134311883/3380881.pdf
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5f892e891c457.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e2d1bce0-063d-42c2-a7da-d906e8424023/kesuzuwodaj.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_off0001ba59.bin
b1000c2d674a9b2cccafc01e23daac5462642354f211311fd342817f87099df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA59 5116 bytes
font_01_sfnt_off0001cbc4.bin
3c811886b2df4a1a2fba9d18de16af4605228204cfcd610b22b201bd3c8eff7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBC4 10552 bytes

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