Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a78400aa563dd74…

MALICIOUS

PDF

68.2 KB Created: 2020-11-18 01:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b38053897dd0736bdd7349e604b828c8 SHA-1: 736216eaee520a7a6b19542f3229eb3f99f0a475 SHA-256: 1a78400aa563dd74023ab3643e9cb239efbd54d1033deb6e1ae0acdfd2e3a1a0
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, indicating a link farm strategy likely intended to direct users to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically a phishing or trojan distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffking.ru/123?utm_term=big+stone+gap+series
    • https://cdn-cms.f-static.net/uploads/4444366/normal_5fa785a8c50eb.pdf
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5f89c1c4b950e.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lukuxaluk.pdf
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/vijonugosezigebowo.pdf
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5fa488bd297ae.pdf
    • https://cdn-cms.f-static.net/uploads/4493891/normal_5fb2dbaf76f69.pdf
    • https://cdn-cms.f-static.net/uploads/4413714/normal_5f965961dba26.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ladojenefe/petip.pdf
    • https://s3.amazonaws.com/nonabafat/gemofizesekumavuweponef.pdf
    • https://s3.amazonaws.com/mokuwanibof/vowezaxitosowikosedaxavo.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_off0000ce58.bin
9c0351c07206db77cf2ab15c2144aba27ac0c32a6ff824d2d909713eaf997a1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 5004 bytes
font_01_sfnt_off0000df74.bin
b44925c4c9414ae09ae620e73c4def0be11f4201a38f34337e74ec6b5cc73f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 10736 bytes

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