Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5cf579bca52bf1…

MALICIOUS

PDF

71.1 KB Created: 2020-11-30 02:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b1d3d8af3d87ead54c8c4fb6b985044 SHA-1: e6949826db8233cd168ff31793fd236991fc1951 SHA-256: 3e5cf579bca52bf199f2891f4833afab5faaccec220c77fd61107ba44a1f76a6
222 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent, likely for phishing or malware delivery. The presence of numerous external PDF links also suggests a link farm or SEO abuse tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ggtraff.ru/strik?utm_term=decreto+1295+de+1994+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f874d5848149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389080/normal_5fb79200ec96e.pdfIn PDF document text
    • https://lugilabujenubo.weebly.com/uploads/1/3/4/3/134320616/vafebawefufof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mipeboro/norawetuxirarusisoguxuzas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b471d6ef-958b-4522-999c-cedddf10ace4/ravip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c91cf8-81fb-4996-b7ac-e762c5ce9c0b/87330820860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68471edf-f456-4e70-a779-49907b4e1b60/55682557968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b3eb258-2d20-4af6-b53e-6e3cb3d1ff0d/78594633988.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/86415389088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b582704d-7b87-49c9-be9a-2a130edd5ad4/zetakuli.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_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 5280 bytes
SHA-256: ea595203b76fca4e23a108a344f4ae2c0a049788ad2c3a1a2de8738f899accb8
font_01_sfnt_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 11216 bytes
SHA-256: 275e97bce446be38ea369c0765eca3bb3ee71cdb38b35d0665a8e9d294cf6a91

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