Malicious PDF — malware analysis report

Static analysis result for SHA-256 baaff4b88e48707d…

MALICIOUS

PDF

64.4 KB Created: 2020-11-25 18:07:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e4168bd189bdb5f20c3fe616d5c0a62 SHA-1: 61659f32cafbf62e230d0306d186b16209f18b8d SHA-256: baaff4b88e48707de032b9606d23465bc6af4ede45c73f2db7ed50a23038d54a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://traffking.ru/strik?utm_term=webster+third+grade', which is likely used to redirect users to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://traffking.ru/strik?utm_term=webster+third+grade
    • https://cdn-cms.f-static.net/uploads/4489717/normal_5fbdc034bd638.pdf
    • https://cdn-cms.f-static.net/uploads/4489609/normal_5faf7628c4008.pdf
    • https://cdn-cms.f-static.net/uploads/4490524/normal_5fb81c17c32fe.pdf
    • https://fabuxitewuf.weebly.com/uploads/1/3/4/3/134349615/rudaje.pdf
    • https://cdn-cms.f-static.net/uploads/4423699/normal_5fb5fa281d457.pdf
    • https://xesupolapiban.weebly.com/uploads/1/3/4/5/134586318/tubom.pdf
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/tidekemotavizaw-jefigik.pdf
    • https://cdn-cms.f-static.net/uploads/4444114/normal_5fbe60436e51a.pdf
    • https://dodimugu.weebly.com/uploads/1/3/4/4/134483739/bd315755a87.pdf
    • https://lemurowivavaxub.weebly.com/uploads/1/3/4/4/134404776/1b60ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bea23b7d-6967-4baa-88b0-5f2c9e686ff3/dazagosel.pdf
    • https://uploads.strikinglycdn.com/files/a88128ab-594c-47bc-a745-6d331789a0e9/o_que_significa_cpp_no_simples_nacio.pdf
    • https://uploads.strikinglycdn.com/files/93e06779-36c0-4b82-a584-3a15717ded57/35463149004.pdf
    • https://uploads.strikinglycdn.com/files/e5c7742b-615f-4875-ae0d-239cf4382e95/secret_of_mana_remake_walkthrough.pdf
    • https://uploads.strikinglycdn.com/files/09fa1550-e7b3-4a3d-8cf7-8f41d4110e85/85911710197.pdf
    • https://uploads.strikinglycdn.com/files/3c02153e-04dd-4bcc-bb84-403f678d25d8/36823590608.pdf
    • https://uploads.strikinglycdn.com/files/7c4525d8-96c0-4920-a21f-165600a9c432/67055700679.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b578.bin
c20d6a0755c5f1d227ef6c15b0b13e0df822f3fa11d70453f8f4e370f03e9d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB578 5208 bytes
font_01_sfnt_off0000c728.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC728 1800 bytes
font_02_sfnt_off0000cfb5.bin
6da30453ab49b5cdacbdf7fc541842d1b38a0982d3a1bd25c9c193d897ebf2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB5 10496 bytes

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