Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca49abd48c1d069d…

MALICIOUS

PDF

72.2 KB Created: 2020-12-29 20:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81f7dda329f10cdbbf1c5ca46a8e655d SHA-1: 1c9d2b3dc71bef0bc8cf54a48492a281acab8be7 SHA-256: ca49abd48c1d069d7c41b045c71df3cf8821bf7f06f28c474bcafbb349f0f094
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector at `traffmen.ru`. The heuristic `PDF_SEO_LINK_FARM` indicates a large number of links, suggesting an attempt to drive traffic to various sites, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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/strik?utm_term=teachers+union+massachusetts
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bewoti.pdf
    • https://cdn.sqhk.co/daguvemet/dhegeLv/pitbull_dog_puppy_price_in_pakistan.pdf
    • https://cdn.sqhk.co/munemuzabuk/ibFbgiY/learn_spanish_for_beginners.pdf
    • https://static.s123-cdn-static.com/uploads/4384484/normal_5fc3a28711156.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kukazowox/xegare.pdf
    • https://s3.amazonaws.com/tugumeb/72827104100.pdf
    • https://s3.amazonaws.com/mexavofezoxi/application_form_creator_online_free.pdf
    • https://s3.amazonaws.com/xipavir/internet_manager_crack_myanmar.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_off0000deeb.bin
abc92ed96e4375aeaa2b844dec16fe8929871b61c5ab65251c468863ce078356		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 4956 bytes
font_01_sfnt_off0000ef99.bin
762615932cf66e3877934a8f7119198e105e117bf6368257102ddf5966211ab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 10740 bytes

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