Malicious PDF — malware analysis report

Static analysis result for SHA-256 59417f1a75f3941c…

MALICIOUS

PDF

69.5 KB Created: 2020-11-17 05:13:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 922c7b5976bced953a52ea1adb867119 SHA-1: e829329c2e8150989332362c86a46a406f9c40d9 SHA-256: 59417f1a75f3941c38c55b87065fc32737f32fe2bb17db1d26e22b12d28de100
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to direct users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=micro+830+user+manual In PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/bekabasuref-rexokaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f874c714669c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_5fa84ae6886a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f95db570f6ac.pdfIn PDF document text
    • https://namoniwuxixipej.weebly.com/uploads/1/3/4/6/134606628/luxakudavedozigi.pdfIn PDF document text
    • https://rokumetusemep.weebly.com/uploads/1/3/4/3/134382705/cdda6a004b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_5f9f6add0c760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5f99ec43ae448.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c96196-0709-43e4-bd5c-a902e5c815d8/rosidufofumolegexadowun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173b72d4-c8b6-4226-b887-57d4eb72465f/favagizejutotuvajez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafbdd7b-8e46-4f6f-8120-24d5f60c20b7/lokakuk.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/84272064420.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/32408888255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54edd8d-3a05-4175-af91-89bdc7427d93/carburetor_nptel.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_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 5448 bytes
SHA-256: 652b9e799662e652c1a96e019d3b851466ad36ac0638a4313e811667b78bb578
font_01_sfnt_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 10192 bytes
SHA-256: 21367c97bab8d2e64f66a0729cdef71d96d2e0cab5c1a72df4f0aaa8e5314e01

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