Malicious PDF — malware analysis report

Static analysis result for SHA-256 330c8b9b675bbca7…

MALICIOUS

PDF

70.1 KB Created: 2020-11-20 04:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4324803d85f715017361a75ee45417f SHA-1: 1dd3479b39c7db8684b97b9e626284f71743c014 SHA-256: 330c8b9b675bbca7825a4d0be9d9a8928bf2f98f84f6d004c4bab759c591876e
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 link farm, and is flagged by ClamAV as a phishing trojan. The embedded URLs likely lead to malicious content or further phishing attempts. The document's structure and heuristic firings suggest it is designed to redirect users to potentially harmful websites.

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://traffset.ru/strik?utm_term=ncr+non+conformance+report+template
    • https://cdn-cms.f-static.net/uploads/4470961/normal_5fada5bd714bc.pdf
    • https://cdn-cms.f-static.net/uploads/4462093/normal_5fa4f3338977e.pdf
    • https://judiwufafa.weebly.com/uploads/1/3/3/9/133999980/af4c211f7.pdf
    • https://bafuvaki.weebly.com/uploads/1/3/4/3/134336870/2cfaab96d7d.pdf
    • https://cdn-cms.f-static.net/uploads/4386839/normal_5f91ae6a60e50.pdf
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5f8c84ebf1d50.pdf
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5fa3619aa686a.pdf
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5fa4b7602a12a.pdf
    • https://cdn-cms.f-static.net/uploads/4445544/normal_5fb412931e1b1.pdf
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5f8fab3362b09.pdf
    • https://cdn-cms.f-static.net/uploads/4384149/normal_5f9d65198b899.pdf
    • https://cdn-cms.f-static.net/uploads/4478127/normal_5fa71064c610c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d719bf48-dd21-4840-b4bf-f5c97c05966f/tuwopov.pdf
    • https://uploads.strikinglycdn.com/files/d7ef21b8-ea18-40d5-aed9-c737fbe57328/96868245166.pdf
    • https://uploads.strikinglycdn.com/files/e0645457-8cb1-45f2-9fff-b81a67b091f5/analisis_sintactico_selectividad.pdf
    • https://uploads.strikinglycdn.com/files/db29c1f9-99a3-4e9e-a182-637ef4ef4c5b/37654037792.pdf
    • https://uploads.strikinglycdn.com/files/ccb9422b-9090-49e6-a281-74aaa9cb4126/xiporuneruwefenavivariv.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_off0000ca76.bin
335cdf0aa78e727dc866435fbe92aa9c2bb22cc15d81188de9d999594a37c461		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 4692 bytes
font_01_sfnt_off0000da3e.bin
06797cc61e4372c4d3ee261babffc2ba4713c1e5149a83bea4ef69e87427e897		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 10304 bytes
font_02_sfnt_off0000fd4b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 4324 bytes

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