Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9df1a710b099fcf…

MALICIOUS

PDF

68.4 KB Created: 2020-11-23 20:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 966b3e03525d8831db7d880ffc10d75d SHA-1: d242d271050347ef6dc03aa382b5495aaa289f2c SHA-256: f9df1a710b099fcf4a244c13e99e64047d5dd627204597472f5183f27ea029a4
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=duel+links+duellanten+herausforderung+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5f8fde6049898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_5f90e313dcf5e.pdfIn PDF document text
    • https://jatozaboko.weebly.com/uploads/1/3/4/5/134529560/7191130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_5f8d10d0ee28a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_5f8f3f1080674.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/981089.pdfIn PDF document text
    • https://gekomawaloloro.weebly.com/uploads/1/3/4/4/134443710/8b23f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f88923e68be1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c788199-5d5a-4eff-b99c-bea856291c5a/16_inch_hubcaps_toyota_camry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1fd9ce-d672-4132-8137-789694ac3e56/80809940933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0536b7e4-9c7b-41f9-ac3d-9e39dd767a8c/22094657357.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB61 5396 bytes
SHA-256: 1d00171692a95cd7f8584011eb7001d78880cd18ea5419bdc6a877b2a92cae73
font_01_sfnt_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 11288 bytes
SHA-256: aff8ac05f1b96e5762b2fb0c0886a61d23cd348e7f754f98bac294142def37e2