Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25c10ffa06e4d0d…

MALICIOUS

PDF

65.7 KB Created: 2020-11-23 21:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fe39208b8060e3004a90de4c02f1410 SHA-1: 131472419d0f0cce693877fae2433f210090ee1f SHA-256: e25c10ffa06e4d0db88eb6e67cf268e354b57c334540066a51db6330680cce92
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'traffset.ru' and a query parameter suggesting a lure for 'best keygen music'. ClamAV and ML classifiers strongly indicate maliciousness, identifying it as a phishing or trojan PDF. The presence of embedded links suggests an attempt to redirect the user to a malicious site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=best+keygen+music
    • https://cdn-cms.f-static.net/uploads/4394079/normal_5fa3dbeec2a4a.pdf
    • https://cdn-cms.f-static.net/uploads/4444371/normal_5fa8322da41e6.pdf
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5f90b12aba77c.pdf
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f9c93882b0d9.pdf
    • https://cdn-cms.f-static.net/uploads/4456135/normal_5fae42a6b723c.pdf
    • https://cdn-cms.f-static.net/uploads/4408343/normal_5fb3e69832398.pdf
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5fa56d4e7b886.pdf
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/mareminijagux-kowuxatulebelo-rupubimotupin.pdf
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5f89b8859c9e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/518685fc-66c9-4bcc-89ef-0e976586f7a5/82202807905.pdf
    • https://uploads.strikinglycdn.com/files/e816255b-4877-4a7b-a1e4-7239bc65ab8f/les_limites_de_la_croissance.pdf
    • https://uploads.strikinglycdn.com/files/613decef-6ff1-420d-8cf1-718ffed1aed0/72127590069.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae1e.bin
dbc02440fe9fa7281c3c63ac65108a51c2c10c2e30d619e16179385adb273dfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1E 4996 bytes
font_01_sfnt_off0000bf31.bin
2dcc2cb7d3fe1a8fa6b10e69c0d909b1f1147511da4aa0936917dc8c34980cbb
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF31 10980 bytes
font_02_sfnt_off0000e4fd.bin
7960312706b4b6b80d6c1a02ea1d86f4abfcd1c95e1c992a0b0d227df3d9580a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 16208 bytes