Malicious PDF — malware analysis report

Static analysis result for SHA-256 166b0ca56a56cdc1…

MALICIOUS

PDF

67.2 KB Created: 2020-11-20 02:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66b68eaafb968f3fd048a09c693bff1a SHA-1: be61b93bd6a2b9ed70d7d5402a4216c40df3a508 SHA-256: 166b0ca56a56cdc1093fd6ae72ecef0f28392a17e1af8028b4a2eb5cb09e6f2d
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, many pointing to Weebly and other hosting services, indicative of a link farm or phishing campaign. ClamAV and ML classifiers strongly indicate maliciousness, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external links suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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-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://trafffe.ru/aws?utm_term=nws+holdings+limited+annual+report+2017
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/xusilepevi.pdf
    • https://cdn-cms.f-static.net/uploads/4410953/normal_5fb6f0338f57e.pdf
    • https://cdn-cms.f-static.net/uploads/4413370/normal_5f994884b90b5.pdf
    • https://monotuwisax.weebly.com/uploads/1/3/4/5/134589760/vopaxetosalel.pdf
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5f923cd3a1d52.pdf
    • https://cdn-cms.f-static.net/uploads/4489240/normal_5fb40ad0c873f.pdf
    • https://nowigusoludi.weebly.com/uploads/1/3/4/2/134266380/sepijabo-dijerob-xetolakajudokol-bewop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wiwamoxamo/olympus_workspace_user_manual.pdf
    • https://s3.amazonaws.com/zetare/55638469955.pdf
    • https://uploads.strikinglycdn.com/files/ecf92f77-b838-4eb1-ac00-71225a3ebff0/paluzopemuvezonetuv.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_off0000c9c4.bin
6b977757434aef95936ea08cd9be8f60304ca6abcf8453c7ea66a6eb9e0b5fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C4 5840 bytes
font_01_sfnt_off0000dd9f.bin
8fbadf46833a8901cb60229635ecca883ed9e492c3cbcc4fc6cc53eb497e8bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 10116 bytes

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