Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d476e18d58eb4bf…

MALICIOUS

PDF

59.8 KB Created: 2020-11-29 19:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1a347295af50b7b648596e3fdea3af60 SHA-1: 1bc1e6faf998db27d98b5cc97cabeec8bc20043e SHA-256: 3d476e18d58eb4bfb5d2c3653378bb4df7e0ddbf534e2bd8f56d23ad0e4e56b1
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with several pointing to known malicious redirector infrastructure like 'traffking.ru'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, contains metadata suggesting it's a PDF related to a 'Hebrew greek keyword study bible', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://traffking.ru/123?utm_term=hebrew+greek+keyword+study+bible+kjv+pdf In PDF document text
    • https://tolafapod.weebly.com/uploads/1/3/4/4/134486806/rumibo-ziwon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5fbad7975af19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416321/normal_5fbfb5cc08a06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390323/normal_5fa56af2a9241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f9187202d951.pdfIn PDF document text
    • https://sekojeti.weebly.com/uploads/1/3/4/5/134583019/7858208.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/tevigotu/rojiwojabovumalevijutumeg.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/46822059330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c36a1d36-8528-402b-b3b7-8c2a87f6167e/31681053901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688c78a5-794f-437c-81db-4bde9bdb4d96/46089949264.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_off0000aaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA7 5492 bytes
SHA-256: 331c97fa21f10a3307e41075d90a0e44480a0fa2429c54333b36be0ced191767
font_01_sfnt_off0000bd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD87 10816 bytes
SHA-256: 34e550e03ca2dc08d104481aa3da013b89c67ede0780080221b0d9794ab54df7

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