Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f1f43cea5ae890…

MALICIOUS

PDF

65.1 KB Created: 2020-11-11 15:06:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40e3ef6623a770ecb77b0f06ef311d0a SHA-1: d8e748bcf92c4bd62645e5aeb168f488f91b61f0 SHA-256: 03f1f43cea5ae890b46a5656991f7bc7a7bf04e43a2984ebf6aac07d6c1eec85
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used to redirect users to malicious websites for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://trafffi.ru/aws?utm_term=kolcaba+s+theory+of+comfort+1994
    • https://cdn-cms.f-static.net/uploads/4403271/normal_5f93a88830c31.pdf
    • https://kutusavirub.weebly.com/uploads/1/3/4/2/134265758/ef4ad34e9917.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d400325-9323-46d5-8630-2d8fab767fa5/aportaciones_de_los_mexicas.pdf
    • https://uploads.strikinglycdn.com/files/9831bdcd-3832-4414-99ea-4bd1068719f1/22746758667.pdf
    • https://s3.amazonaws.com/vexosafugunu/zajajen.pdf
    • https://uploads.strikinglycdn.com/files/8018b0d2-f938-4513-9b34-7741fd93a2b4/80590640757.pdf
    • https://uploads.strikinglycdn.com/files/2d8d88ff-a1a6-4581-a557-00157c8eca00/59222360574.pdf
    • https://uploads.strikinglycdn.com/files/8d11f080-3252-4cad-9775-6d93b57ec1ec/chapter_6_meiosis_and_mendel_vocabulary_practice.pdf
    • https://uploads.strikinglycdn.com/files/2fc4cccf-741b-492e-96a4-f464e31d2178/stormblood_pre_order_bonus.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_off0000c1c1.bin
453b64219b83699576168142bb5bf5711c7dedeba6e34da82337a384c89ff831		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C1 5628 bytes
font_01_sfnt_off0000d4ce.bin
f0011c2e11fd73de15f76a2b9d44ca7ab4339d87e5f76cd3cb4bd5774c7c73a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 10300 bytes

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