Malicious PDF — malware analysis report

Static analysis result for SHA-256 537b8cc9686c2791…

MALICIOUS

PDF

86.3 KB Created: 2020-11-20 02:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de6e8f5b03a400afa7ce48357b1169a4 SHA-1: d3d4a791ce408b10044e1a62534b78304fb22aa1 SHA-256: 537b8cc9686c279124a97c38fe0f6492d33119387c62a34b07142bf42285ebe5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDF files, indicating a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

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://traffine.ru/aws?utm_term=nfhs+basketball+rules+2017-+18+pdf
    • https://zemezomar.weebly.com/uploads/1/3/4/7/134711889/6714870.pdf
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5faac6d6dc24d.pdf
    • https://katidifivova.weebly.com/uploads/1/3/4/7/134715674/repizas-zokenupu-taxunapiragopi-vuxed.pdf
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5f9c97c91b3ff.pdf
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5f944da0dd44e.pdf
    • https://rafulosuzeme.weebly.com/uploads/1/3/4/2/134234553/3ebf2c9b.pdf
    • https://cdn-cms.f-static.net/uploads/4377936/normal_5f94836bedf9e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wexukufedepim/23168912942.pdf
    • https://s3.amazonaws.com/voxulija/liberty_township_butler_county_ohio.pdf
    • https://s3.amazonaws.com/fadobirak/derisumexemed.pdf
    • https://s3.amazonaws.com/jiwisi/mulusamejanatekepid.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_off00011283.bin
c0ad8ff1979c1d99c311f716d2c818681fade8140e4c36020257f12333553522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 5936 bytes
font_01_sfnt_off000126c2.bin
1720311a409837fe2c52bebfe1d8010baa65d36b2763019d3ac114c64be55e50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 10532 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.