Malicious PDF — malware analysis report

Static analysis result for SHA-256 17dd8a42270c8a57…

MALICIOUS

PDF

75.0 KB Created: 2021-03-23 11:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0adebdbee6778e44d9488073cad2fa0a SHA-1: 862c4ae1912a6184e2c49c2fb145aa8278a7ddf4 SHA-256: 17dd8a42270c8a57f2465b504747389b7129f65dc66c2d21d2aaa1c9b1b22789
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or distribution mechanism. The ClamAV detection and ML classifier indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains metadata related to 'Thesaurus dictionary pdf' and the authoring application, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8924

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://dugedepap.ru/award?keyword=thesaurus+dictionary+pdf
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/7241906.pdf
    • http://nezowigivomi.scienceontheweb.net/kokupaku.pdf
    • https://cdn-cms.f-static.net/uploads/4425483/normal_6041991b40caa.pdf
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fd13a878038a.pdf
    • http://wixosefimaba.scienceontheweb.net/lupikavokobexu.pdf
    • https://zegaturivelegob.weebly.com/uploads/1/3/1/4/131437779/pezubegaxijifaw_kegime_ridowili_vebaselufiguwe.pdf
    • http://tebogekememesij.mygamesonline.org/ziwota.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rirusozo/38055735025.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/xevetadaneku.pdf
    • https://s3.amazonaws.com/sugowubuf/76409330353.pdf
    • https://s3.amazonaws.com/winumigutam/vavexedibifigut.pdf
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_79716cf174ae4d0986935fcb61699e5c.pdf?index=true
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_43b5a4d761b64c60b4bb86d65d88f5bf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/93cdbed6-15f2-4602-93f3-371cb23504c8/jajadepit.pdf
    • https://uploads.strikinglycdn.com/files/f70bba90-932f-4b6e-bdd3-122729ef7c2c/how_to_use_controller_on_dolphin_emulator_pc.pdf
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_f22e71c8268a4d22afeaa122bfeed060.pdf?index=true
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_851dc3bd79d2492ebe1b7881633188a7.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115ff.bin
b00122ae18ecc59a5c0bb38eac56b36584ea7c71cc10a5b112f94db52b1b0838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 5260 bytes

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