Malicious PDF — malware analysis report

Static analysis result for SHA-256 d717b30bc3b8e73d…

MALICIOUS

PDF

67.4 KB Created: 2020-11-17 16:13:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f112915265303ed569b094776b6fc8a0 SHA-1: d8ba7f664541091d04d6377152595aba9f7451cc SHA-256: d717b30bc3b8e73d717f3fe16cfa115e66b67ce879e7b29520e2080938d87f3a
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/123?utm_term=kinetic+molecular+theory+of+matter+liquid PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f9b3bd3ae96c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_5fa80a2852327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f87382a843d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f8b4b8de06d6.pdfIn PDF document text
    • https://vuxidozeni.weebly.com/uploads/1/3/4/6/134669409/zalixexawosibemufo.pdfIn PDF document text
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/6351374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_5f98db538265a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5f9a2ce7bc361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455914/normal_5fa7b1ce85aea.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/2fa82405-808b-4416-8122-11c386eddb2f/ziwopidikirilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9117c258-83d3-48a0-b9c7-e06b119489b8/1983146284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea6c729-311b-4edc-a3d7-e6d194ab3322/85629090867.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_off0000cad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD6 5280 bytes
SHA-256: 40b88632fe8adfc9350650efab71ebd33b24005f615711e2592a3b49ce0b491b
font_01_sfnt_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 10596 bytes
SHA-256: 120f4d8da21e91e98e66dabe429454385c37ef24b5a564ed19357873b9b93f03