Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf35e3b9c248636…

MALICIOUS

PDF

66.5 KB Created: 2020-12-23 04:37:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 878627b5d7b5484b938b3b8c2ddf38b1 SHA-1: d850a124e5a24dcce8e25d9f9a5cff0a673a6a47 SHA-256: 7bf35e3b9c248636dec270e1271e55bc8ffc7206ecb89eecbf6c7f90d2b2dcd0
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/strik?utm_term=godus+all+voyages PDF link annotation
    • https://minezutoka.weebly.com/uploads/1/3/2/6/132695516/3375335.pdfIn PDF document text
    • https://ludiwutigavas.weebly.com/uploads/1/3/4/6/134697468/8360c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448129/normal_5fbee966c67b8.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/pasemubosibesazavisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418171/normal_5fc0d0e59c71a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403946/normal_5fcfa7e8c1583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fb81d4556aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_5fabd09073ac1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449616/normal_5fe233a50d4d0.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/kegitinekifiwo-siwuwula.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/552c2b7b-5c3c-4751-aa48-250e3d351d9c/preparation_entrainement_de_foot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fcd4a6b-0713-4dbe-8d0c-56310a5ef017/spilled_milk_book.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_off0000c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 5088 bytes
SHA-256: 17842433e3ec378ae2616b2c98ae5dbccbe848a47653ecca2f81b64d2323fe61
font_01_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 10208 bytes
SHA-256: 9043e5d67d236f9eebc5e588fb5cc2f22c97d8c2acb50bb12070cbe29a532323