Malicious PDF — malware analysis report

Static analysis result for SHA-256 def6333b877c8e82…

MALICIOUS

PDF

70.6 KB Created: 2020-12-17 04:38:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 105365cdbb520f2923bf9a7af18f44b7 SHA-1: 14e0daaf7c293a9cc5eeaa0b0d4da67844dd3a7d SHA-256: def6333b877c8e82b612bd841bfb95f90c6e27b2137aee8fa225fb76a927c8a3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting it's used to distribute malicious content or for phishing. The embedded URLs point to domains commonly associated with malware distribution and phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=iphone+11+giveaway+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392864/normal_5f99db0c674f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419204/normal_5fc4bdf0ecc2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419642/normal_5fc3453d67f7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417990/normal_5fd95a5098ff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452381/normal_5faee74168a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_5fda8dfcd741f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f89b094ed895.pdfIn PDF document text
    • https://dikoriwapajok.weebly.com/uploads/1/3/4/4/134447187/1362471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_5fc2c90088ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_5fa6f1248c869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf65fe173fb5383b9a6eda/1606379006301/40142634955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370d6c12-e2eb-458b-9f45-48537320d66f/but_in_all_things.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC966 5000 bytes
SHA-256: 4177a10052d0ac07cd2eb12a9aa8db885e1250adcf093ef9bdc1ca685701ce31
font_01_sfnt_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 10836 bytes
SHA-256: e0b364e6b0a118c0d3dfd7a51fe7924f7d2d7eca0191d20523ba5e8a5b082416
font_02_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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