Malicious PDF — malware analysis report

Static analysis result for SHA-256 2687157073241aef…

MALICIOUS

PDF

58.4 KB Created: 2020-11-25 08:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19b3ea54965e0bf499b322af7e4ebd26 SHA-1: 126b21f67abef25974eecd63d86052791cdda277 SHA-256: 2687157073241aef5779d175960e57b3287411527163d5bf44bacde13507fdff
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'trafffi.ru', which is likely a phishing or malicious site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, potentially to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://trafffi.ru/123?utm_term=carvel+crunchies+calories
    • https://cdn-cms.f-static.net/uploads/4378170/normal_5fa3cbe02cabc.pdf
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5fbce74186981.pdf
    • https://cdn-cms.f-static.net/uploads/4383444/normal_5fad36fd80d33.pdf
    • https://cdn-cms.f-static.net/uploads/4409813/normal_5f9c60ffc84d5.pdf
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5fbd7f0ce70df.pdf
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5f8a55ad58fca.pdf
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5fb2a114a1f9e.pdf
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f877a675242a.pdf
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f94d6a89c72d.pdf
    • https://cdn-cms.f-static.net/uploads/4379961/normal_5fa2a70d68e7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/532c2a64-23d3-478f-9e0b-1a699dd600af/calories_in_fried_potatoes_in_vegetable_oil.pdf
    • https://uploads.strikinglycdn.com/files/6eb3303b-4695-4c8d-bb06-bec64350611d/jatejeredewumamutokude.pdf
    • https://uploads.strikinglycdn.com/files/9b149fd4-fc7a-47eb-b278-f540435e1131/portada_institucional_uvm_word.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_off0000ab4d.bin
c09f3778dc905ca890bb472c80f3b818b7f4148da437365447c054e2b5176924		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB4D 4852 bytes
font_01_sfnt_off0000bbc3.bin
41fba47ac339cb6359555fb78c631251714daca55b9eb3544aafbbdad856f73f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC3 9824 bytes

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