Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cb5daaa75fe040…

MALICIOUS

PDF

67.9 KB Created: 2020-11-20 02:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 55dd07197cdb07060772a85aadfcc2b1 SHA-1: 7fcb1a4fe1487b214304694c23b08e8fff1ca2a9 SHA-256: 91cb5daaa75fe04052b4a141043ca962ed95680e31de68c6178388111c2a4aa8
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it's a phishing or trojan delivery mechanism. No scripts were extracted, but the presence of numerous external links points to a link farm or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=a+history+of+western+philosophy+kindle In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5f92eb4c55416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401985/normal_5fac512cde50e.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/pelafogolobeteso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401559/normal_5f90a77d15dc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5f9c6577b0a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_5fa098dab930a.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/4135625.pdfIn PDF document text
    • https://jomefibid.weebly.com/uploads/1/3/4/5/134596324/1348070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f93bf8063e6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/bulbulay_pakistani_drama.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/tulipuva.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/georgetown_texas_to_big_bend_tx.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/zuponilefodanu.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/83552822664.pdfIn 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_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 5168 bytes
SHA-256: 0f9e04484d19908bfd8b1d1a04be4e381dc348f01f4a0665abf1ac009eaef3b2
font_01_sfnt_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 10964 bytes
SHA-256: 7f1015e92827eae15d98beb1bdfe3a92826737faa7fde88af671355959da1a64

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