Malicious PDF — malware analysis report

Static analysis result for SHA-256 4931ab5e9ff26b58…

MALICIOUS

PDF

67.6 KB Created: 2021-03-10 15:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f29f821cabb9b4dc55833ee9d431addc SHA-1: 3169b531f2875cf9dea30a99792c3d3901c703d7 SHA-256: 4931ab5e9ff26b580950e16fd848bec241f419e694a96bef47b7cc5f146b283b
154 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains references to 'Macbeth act 4 scene 3 quotes' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious nature of the links. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support the conclusion that this file is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8294

Heuristics 4

  • 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
  • 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://gimoguvi.ru/aws?utm_term=macbeth+act+4+scene+3+quotes
    • http://kutatit.getenjoyment.net/what_is_the_best_pressure_washer_to_buy_uk.pdf
    • http://poxinezov.iblogger.org/32202173252.pdf
    • http://homeolimp.com/549677136170o4pf.pdf
    • http://ionatr.fun/9015468199odpdf.pdf
    • https://cdn-cms.f-static.net/uploads/4466151/normal_5fdad51e8b413.pdf
    • https://cdn-cms.f-static.net/uploads/4378152/normal_602c5e06dad12.pdf
    • https://cdn-cms.f-static.net/uploads/4474446/normal_604161fb1b459.pdf
    • http://tiwirodizefa.iblogger.org/dalasemuxa.pdf
    • http://argo-tourism.com/rizuwemidatam3w.pdf
    • http://kawlites.online/ashoka_movie_in_mp4anmi7.pdf
    • https://cdn-cms.f-static.net/uploads/4480393/normal_5fd87c8c1f6a0.pdf
    • https://cdn-cms.f-static.net/uploads/4377388/normal_604710ad4c61d.pdf
    • https://cdn-cms.f-static.net/uploads/4389585/normal_600ae8a0c708a.pdf
    • http://sigisuzuk.getenjoyment.net/tijujogalaladuguragena.pdf
    • https://static.s123-cdn-static.com/uploads/4446931/normal_5ff0679890fb5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_f790bb9f2a68471ebc99752939d4cce9.pdf?index=true
    • http://sanaxumidi.epizy.com/kuzebukebetebumoxakugugen.pdf
    • http://pudolajuji.atwebpages.com/rapaletejodoxibufado.pdf
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_ac98b3ca36f8423d85c702f0e9077766.pdf?index=true
    • http://namavorudil.epizy.com/what_does_the_trunk_of_the_tree_of_life_symbolize.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f69b.bin
9a9ddc9d7ae6fd88e18cadcaf1bb8334159a66a98f0e090ba4d3d55bdd96b23f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 5284 bytes

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