Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee2f54782c4a3e3…

MALICIOUS

PDF

87.4 KB Created: 2021-01-01 18:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8dec684826bd3454aa6d04fe8de1e01 SHA-1: 728df2da1dcc1dc13d8159e0e63c0db510d3ea0c SHA-256: 7ee2f54782c4a3e3e9c0bb952152da2bd91e9f5b2825b1d70607b24d017d89c8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure or malware distribution attempt.

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://trafffe.ru/strik?utm_term=good+captions+for+picture+with+friends
    • https://cdn-cms.f-static.net/uploads/4413362/normal_5f9b2f10eecd9.pdf
    • https://cdn-cms.f-static.net/uploads/4374840/normal_5f8cc97c9525e.pdf
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/4103467.pdf
    • https://cdn-cms.f-static.net/uploads/4372983/normal_5f9f83d7bf0c3.pdf
    • https://cdn.sqhk.co/vizinifum/jbgiDgf/93865322667.pdf
    • https://cdn-cms.f-static.net/uploads/4446034/normal_5fb83eb87cde0.pdf
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fcc9ff3265fe.pdf
    • https://static.s123-cdn-static.com/uploads/4459916/normal_5fef04b7b458c.pdf
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/sesakaf.pdf
    • https://kixodebu.weebly.com/uploads/1/3/2/6/132682063/vuberogurol-lavon.pdf
    • https://semopadilined.weebly.com/uploads/1/3/4/6/134696525/danenimev.pdf
    • https://cdn.sqhk.co/pewovixosafu/WHiiijI/23169782510.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ef93c3b4-95c0-4d89-9791-d8b225a61eee/phim_le_hong_kong_long_tieng_moi.pdf
    • https://uploads.strikinglycdn.com/files/adfeacf3-80a2-4335-98dc-cda8947b4ba2/everyday_writer_5th_edition.pdf
    • https://uploads.strikinglycdn.com/files/57e53a86-de66-4335-b92e-230cded1e4ea/14284587458.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_off00011995.bin
df2b1e2c8d92ae7173e509e79d08557cc1a84105c8c33a3509d2cb09b5673a7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 5332 bytes
font_01_sfnt_off00012bc7.bin
a6be9cb1cc8ebbe9bb3b1ba0df4516e39278aa0a92513389d804de431dc66ba9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC7 10764 bytes