Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef89cbcb568f2d4…

MALICIOUS

PDF

80.7 KB Created: 2020-12-14 12:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5aeee0d9b6ea8bf8449d9949296d412 SHA-1: 40e66ce0eb461c1c48c571c1cea2eb2778e3c7dc SHA-256: eef89cbcb568f2d4863e0c1d141f962b106ad5a78e1fc7b780c09ffd0c70d445
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary links, 'https://traffset.ru/123?utm_term=krk+rokit+6+g2', is flagged as suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=krk+rokit+6+g2
    • https://static.s123-cdn-static.com/uploads/4388406/normal_5fcc3e1cb914b.pdf
    • https://vuteduwezo.weebly.com/uploads/1/3/4/3/134336695/8dcd7d32e43.pdf
    • https://static.s123-cdn-static.com/uploads/4470975/normal_5fcd02691de43.pdf
    • https://static.s123-cdn-static.com/uploads/4480898/normal_5fce186fbfd5e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc6a6afc6229360ecd4fc1b/t/5fcfeec08157c143f19c86fe/1607462593211/cyber_hunter_hack_ios_download.pdf
    • https://static1.squarespace.com/static/5fc326f27848ba205d273b7f/t/5fce0d1b5177ea328ce91b01/1607339292877/asa_5500_20_security_contexts_license.pdf
    • https://static1.squarespace.com/static/5fc17a540b6b03258f39a641/t/5fc84976bbb7f45a928538f2/1606961527724/jonujubivunet.pdf
    • https://static1.squarespace.com/static/5fc2aa5268612547ed696d4d/t/5fc7a9d1ad3e6411924dd2e6/1606920659260/49508198936.pdf
    • https://static1.squarespace.com/static/5fc0e6bd3398ff75152e0f70/t/5fcb0a3426a2be7f6ddd5cc5/1607141942790/95257029000.pdf
    • https://static1.squarespace.com/static/5fc5de1b7848ba205d3add58/t/5fcd5794c836a917f91d7a5e/1607292821148/3352658725.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_off000100e9.bin
1cc9cbfb26e9d7872aab11b546d277d545c88f22e4aa9657039c6d90f996836b
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 4752 bytes
font_01_sfnt_off00011132.bin
e563bbb7b85bd5daf4c87cecc5c0ec240a0d44b50ee0cd60a0e22255ba36dfa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 10912 bytes