Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62b8221c988fc50…

MALICIOUS

PDF

67.4 KB Created: 2020-11-18 10:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f26802d0e08aa7ef6fb705e4af27cd88 SHA-1: d60db5600d30550e32e06fd37bc3980c065148c1 SHA-256: f62b8221c988fc50e26e7d4f078cfa3c0c083474e426cb46d12dfc2f2bafafd5
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=the+guild+handbook+of+scientific+illustration
    • https://rebifigu.weebly.com/uploads/1/3/4/6/134663288/79637.pdf
    • https://cdn-cms.f-static.net/uploads/4405181/normal_5f93390671eb6.pdf
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5f97c20e835c8.pdf
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f8a885cc2594.pdf
    • https://cdn-cms.f-static.net/uploads/4476768/normal_5fb2ae7df1590.pdf
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5fa2ccf628024.pdf
    • https://cdn-cms.f-static.net/uploads/4426423/normal_5fab58675a180.pdf
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5f8be4e9f3d56.pdf
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5f9563dbb56a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/busutafitufe/chiyoda_watch_winder_warranty.pdf
    • https://s3.amazonaws.com/midaguvimabof/good_luck_with_your_future_endeavors_meaning.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_off0000c9f1.bin
546e81f101df7b5013b82102a0e3541881eb9f9097191939d385bf87cd5d6eda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F1 5436 bytes
font_01_sfnt_off0000dc6a.bin
4b69a737bc6e68903dc63255ebc99253d370d3e7b82330f75f64c0d73156c709		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 10820 bytes

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