Malicious PDF — malware analysis report

Static analysis result for SHA-256 0337b8c6110532f4…

MALICIOUS

PDF

71.0 KB Created: 2021-03-14 07:25:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c28e007ac66abb3617d976a7bbd3454a SHA-1: 173138ec843ca0d0c905fbdc65b8e9b56d29a48b SHA-256: 0337b8c6110532f482ba22367e81abdda4194eee4a0a8f34b2b668f967ea5b5e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm, with the primary URL pointing to a suspicious domain. This technique is often used to direct users to phishing or malware distribution sites. The ClamAV detection and ML classifier further support the malicious nature of this document.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=brocade+vdx+6740+switch+configuration+guide
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/8362663.pdf
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/gumipawu-tisudibiduvog-libabe.pdf
    • https://dufowazana.weebly.com/uploads/1/3/4/5/134529111/kegonabefirajodukefi.pdf
    • https://guvopizap.weebly.com/uploads/1/3/0/7/130776702/nomagofugep.pdf
    • https://static.s123-cdn-static.com/uploads/4366360/normal_5ff34b2cb8393.pdf
    • https://cdn-cms.f-static.net/uploads/4393186/normal_6025617598798.pdf
    • https://noragunefide.weebly.com/uploads/1/3/1/6/131637841/d28a7.pdf
    • http://rijewomel.scienceontheweb.net/96289752606.pdf
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/5422826cadb.pdf
    • https://static.s123-cdn-static.com/uploads/4366402/normal_5ff3c2791f901.pdf
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/3e0df770c7d45f.pdf
    • https://static.s123-cdn-static.com/uploads/4366665/normal_6001a7e39d8ee.pdf
    • https://wazumiwu.weebly.com/uploads/1/3/6/0/136038811/ba421c.pdf
    • https://tujiwukof.weebly.com/uploads/1/3/4/5/134592642/209cd4952d4ada.pdf
    • https://cdn-cms.f-static.net/uploads/4446930/normal_5fdbe2c68102e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xedavabawavela.onlinewebshop.net/sugosazeb.pdf
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_9476668f82f14f788c8b8020575c87ab.pdf?index=true
    • http://kepagewav.atwebpages.com/69396598402.pdf
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_a92fba046699460490d01b90eb5842ef.pdf?index=true
    • 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_off0000d535.bin
2f915c1523aca182791e1ea8841050d4ea1ecc197efda4176a45f81806fb86d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 5984 bytes
font_01_sfnt_off0000e9b6.bin
faf35bf5560d022ae7114b5501a1d68c427930341e9860a3fe92a5df0fc807e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 10204 bytes

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