Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74901cccfbc9e1f…

MALICIOUS

PDF

74.1 KB Created: 2020-11-13 13:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f770edd7a96a7daa32c49ffc6209dea9 SHA-1: 17c50242732f8b9664b19d382b3477b21d0da46a SHA-256: e74901cccfbc9e1f48ae2b9c52a0456142c12676ba6d72977cd634dc6cde972b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, and one critical link to a known malicious redirector. This indicates a likely phishing or malware distribution attempt, leveraging a link farm to obscure the ultimate destination. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=5lb+gre+book+reddit
    • https://cdn-cms.f-static.net/uploads/4456379/normal_5fa8d10e0a60a.pdf
    • https://lakujasoramaw.weebly.com/uploads/1/3/4/4/134400634/a640584346e4.pdf
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/fosebene.pdf
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/db3c03f1a8.pdf
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/2796375.pdf
    • https://cdn-cms.f-static.net/uploads/4406455/normal_5f9b686fe6197.pdf
    • https://begaraga.weebly.com/uploads/1/3/4/6/134652864/notupu_loguzari_xogaxumekupati_gukopajusosedu.pdf
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5fa96c10aa978.pdf
    • https://sozawozoxo.weebly.com/uploads/1/3/4/5/134509422/81adf2a.pdf
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/xajuxerunuxasi-wexujazawik-xiselibu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/42db55cd-a291-4fdc-9f03-8a3d46105c60/37537326525.pdf
    • https://uploads.strikinglycdn.com/files/b54b0aea-0863-40ff-a394-41211b4469ac/63924972805.pdf
    • https://uploads.strikinglycdn.com/files/9d46af5d-3a5c-4a55-a0ff-6d0bded863e8/mulikubudidazirotenux.pdf
    • https://uploads.strikinglycdn.com/files/8601d910-26e1-4421-99ed-f547d190bfd9/63428306858.pdf
    • https://uploads.strikinglycdn.com/files/231ff021-a26d-4eed-8934-0c92d495b90f/egunner_auction_scam.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_off0000e401.bin
1859d726c938c85d7c392c9891265a8beadb59f1c9090858973f09906a7160c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 4840 bytes
font_01_sfnt_off0000f487.bin
f7a4529471048899ea08777a0dc452643d8d64ee82cac98d8c9bed9728debb7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 11484 bytes

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