Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e099a9992a7008…

MALICIOUS

PDF

72.5 KB Created: 2021-03-23 16:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4824509820c6df9e98aaacca7de84729 SHA-1: 7e278e9ca7a3d820291e9b2d3740980455e8a865 SHA-256: b9e099a9992a7008133861b08d61a65c71ac64d598aa0913ebfc7c18d6fb4a09
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://botokaw.ru/strik', which is suspicious. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of numerous links suggests an attempt to direct users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://botokaw.ru/strik?utm_term=kingdom+management+beach+blvd
    • https://cdn.sqhk.co/ganuniwiku/jbgg3gg/fernanfloo_stream_twitch.pdf
    • http://giwudogor.scienceontheweb.net/the_theory_of_moral_sentiments_adam_smith_download.pdf
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/gibixoxowesopi_dozonoruse_gatetijejewoweb_laziravusezo.pdf
    • https://cdn.sqhk.co/siboxowimu/eEyW3MD/budipetisem.pdf
    • https://pivuwexigika.weebly.com/uploads/1/3/4/3/134320842/jujogid.pdf
    • https://cdn.sqhk.co/xenaporo/jMDMm98/83339963482.pdf
    • http://xedeporib.medianewsonline.com/7992594178.pdf
    • https://cdn.sqhk.co/mebosuxular/jcAcl2w/barrisol_mirror.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_f49e713af05044909ae7df9437401519.pdf?index=true
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_8768d2d69df342c5bf7e32514d3eafb8.pdf?index=true
    • http://finirigitu.rf.gd/lilamixo.pdf
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_5fd1fb1be02949b8a25b8ee859225234.pdf?index=true
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_610a7b9cbc014841bef04a5177c2619b.pdf?index=true
    • http://talakukatutevib.epizy.com/38038196700.pdf
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_8281bb64e22945028de6b9a2e83870f0.pdf?index=true
    • 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_off0000dcee.bin
e950c00923583082993207c486c02ee0f1d645556cd076e3829374640ec95763
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 5248 bytes
font_01_sfnt_off0000eeab.bin
ab32eb92a9134a5f06bebbb628f54fd98f9e0623e01bc4f78a8bc8c046fbcbec
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 10648 bytes