Malicious PDF — malware analysis report

Static analysis result for SHA-256 663cd947a7bc74c6…

MALICIOUS

PDF

74.9 KB Created: 2020-11-24 17:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ccb423fdd4776049e6fead19ba65aa8 SHA-1: 1256bc360cdd15b67eba8494468efc07a13b3912 SHA-256: 663cd947a7bc74c64c430331311e82bb0753248b8b1e82f83b5a625c6c950868
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 of which point to suspicious or unknown domains, indicating a link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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://cctraff.ru/strik?utm_term=who+is+the+importer+of+record
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/fawafoxatetuwej_duradozu_jixuxekum_rejejiwonupoxu.pdf
    • https://jomimufigaz.weebly.com/uploads/1/3/4/3/134319247/85c64db2177.pdf
    • https://cdn-cms.f-static.net/uploads/4404523/normal_5fbc8e6912d8e.pdf
    • https://cdn-cms.f-static.net/uploads/4414166/normal_5f944316a10c3.pdf
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/xurejetexu.pdf
    • https://cdn-cms.f-static.net/uploads/4445731/normal_5fa51a4c6e53d.pdf
    • https://cdn-cms.f-static.net/uploads/4470832/normal_5fb8a3252b046.pdf
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f9a342c6618b.pdf
    • https://tizisilanizos.weebly.com/uploads/1/3/4/5/134518587/dekatokolubi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/87d5aa5c-a89d-487d-8be8-1337d500ecd1/depiginisevogawobujopadub.pdf
    • https://s3.amazonaws.com/dadupawo/chapter_12_dna_and_rna_test_answers.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/stephen_hawking_books_free_download.pdf
    • https://s3.amazonaws.com/xajowu/hunter_x_hunter_gon_after_transformation.pdf
    • https://s3.amazonaws.com/desenaz/nitapaxanawiwabutatuzaka.pdf
    • https://s3.amazonaws.com/dudujopixejikug/12134108344.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_off0000e615.bin
3eb132a60fbd22bbc1e7a07860b224a3c95ceb286c7ff9bb503a443b50496374		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 5168 bytes
font_01_sfnt_off0000f78e.bin
39c37b1303123582bee4311b9f980658233417c91bb677270b5d4759cbf6d767		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 11676 bytes

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