Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cb95ba7c594dbc…

MALICIOUS

PDF

75.8 KB Created: 2021-04-21 07:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ce9e0585ad77739b05fa45676424fb0 SHA-1: 2d21c100170f0d3797a8fff34e9d55ff9164efe1 SHA-256: f8cb95ba7c594dbcd47b49cfa9375fd1508d16d182871934a07b44446ed31b9e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF contains a large number of embedded external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://bologen.ru/strik?utm_term=dometic+fan+tastic+vent+2250, which is likely used to redirect users to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=dometic+fan+tastic+vent+2250
    • https://mifesala.weebly.com/uploads/1/3/2/6/132683173/vikukedejonu.pdf
    • https://cdn-cms.f-static.net/uploads/4372354/normal_602df1fb6b6ef.pdf
    • https://static.s123-cdn-static.com/uploads/4379611/normal_5fd05532d59c4.pdf
    • https://cdn-cms.f-static.net/uploads/4446915/normal_60400cc6e98cd.pdf
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5fe859ee3b37f.pdf
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/jeraga.pdf
    • https://wopamogifit.weebly.com/uploads/1/3/4/3/134341426/5280539.pdf
    • https://dikufakeg.weebly.com/uploads/1/3/5/3/135348043/2090f4.pdf
    • https://static.s123-cdn-static.com/uploads/4388276/normal_5fdfc7bbad12a.pdf
    • https://cdn-cms.f-static.net/uploads/4462982/normal_6042512056a9c.pdf
    • https://nelajelax.weebly.com/uploads/1/3/2/7/132712676/sozida.pdf
    • https://wewowalowumuv.weebly.com/uploads/1/3/4/0/134040384/gakapofo_wopego.pdf
    • https://cdn-cms.f-static.net/uploads/4461773/normal_6043458b76dd6.pdf
    • https://cdn-cms.f-static.net/uploads/4418381/normal_6013c4e5ab532.pdf
    • https://cdn-cms.f-static.net/uploads/4445340/normal_6069a32163e9f.pdf
    • https://cdn-cms.f-static.net/uploads/4426971/normal_6054f62c1b22a.pdf
    • https://cdn-cms.f-static.net/uploads/4373301/normal_606e2b6214107.pdf
    • https://folenepawesig.weebly.com/uploads/1/3/2/6/132680852/kizononulinavegowagi.pdf
    • https://cdn-cms.f-static.net/uploads/4485173/normal_6044640e5f27d.pdf
    • https://xopoloxunevagig.weebly.com/uploads/1/3/1/4/131406528/zojepejuzibid.pdf
    • http://sukaxebodaruju.iblogger.org/detubitavemobalolazikez.pdf
    • http://sabafodalukowa.22web.org/aviation_weather_services_book.pdf
    • https://cdn-cms.f-static.net/uploads/4369138/normal_6028e43f204a7.pdf
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/9667373.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fexajorijoworas.epizy.com/46662366832.pdf
    • http://demujub.rf.gd/femobedasarosiroxe.pdf
    • http://lesigoviweti.epizy.com/actinides_contraction.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_off0000e9df.bin
1127ddd6676cd4211de7e1972aabae398fddfc0b998edef45b115d827631cb3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 5356 bytes
font_01_sfnt_off0000fc1f.bin
2d60773be51c49c5d9d65aa1fa3d08ea70e9622b65e16b01b3c5bc16744b48cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 10976 bytes

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