Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8f40fc7a475672…

MALICIOUS

PDF

91.6 KB Created: 2020-11-21 07:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e0840281e7fb329d2af5268bd914a2c SHA-1: 5d12d4742faddc0695a1bb3f98bd0de3f382db83 SHA-256: ae8f40fc7a4756728755fbe3b50f4c0f8858c6143b7e152c4100368e18d7518f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm, with one URL pointing to known malicious redirector infrastructure. This suggests the document is designed to lure users to malicious websites, potentially for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?utm_term=the+eye+by+alice+munro+themes
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5f9040bde91d0.pdf
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/7162528.pdf
    • https://cdn-cms.f-static.net/uploads/4374843/normal_5fa991f80da4f.pdf
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5fb34d21a8108.pdf
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5f8c4d8eead24.pdf
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f9cca581d4f7.pdf
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5fa9628ec01dc.pdf
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f875f2c272f6.pdf
    • https://cdn-cms.f-static.net/uploads/4374689/normal_5f97624803c0a.pdf
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fabc96b42f26.pdf
    • https://femimujuzo.weebly.com/uploads/1/3/4/6/134640298/mebujos.pdf
    • https://cdn-cms.f-static.net/uploads/4374522/normal_5f90eb3e77af5.pdf
    • https://cdn-cms.f-static.net/uploads/4416671/normal_5fb4bca0a4043.pdf
    • https://cdn-cms.f-static.net/uploads/4374542/normal_5f91043310b46.pdf
    • https://lamuvoraraxuz.weebly.com/uploads/1/3/4/4/134486612/kefagovadexu-taxogareni-muromovov-resenozofe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00012903.bin
58d37dde8370573792e09a1962c69be649998da1790caf8cde90add72cc85bce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12903 5228 bytes
font_01_sfnt_off00013aa7.bin
2b5b14db424f2ff807e57918201699275478744a65157a938816467aa8d4407f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA7 11664 bytes

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