Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3c553bd3532f38…

MALICIOUS

PDF

63.9 KB Created: 2020-12-21 09:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1da78cc66f9328c86930469ff5a4f778 SHA-1: e80dd624644f6502a0bfa120250c1e582ed31ba8 SHA-256: 4b3c553bd3532f3887fd68746679832e6efefc9cc652445f1c51e3e5a9c42d1b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'trafffe.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://trafffe.ru/strik?utm_term=diablo+3+death+breath+per+torment
    • https://cdn-cms.f-static.net/uploads/4418368/normal_5fd1fa2198c26.pdf
    • https://lowizozexide.weebly.com/uploads/1/3/0/7/130776176/fitapapetopiruv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f885ec8b-922f-48b3-afe3-6a13f796d452/digital_storm_lumos.pdf
    • https://uploads.strikinglycdn.com/files/eafdba5a-34ff-4d24-9ee1-777555e09cab/56697652612.pdf
    • https://uploads.strikinglycdn.com/files/9834ddd8-714a-4781-bea5-90f4e34ad668/enthalpy_changes_of_combustion.pdf
    • https://uploads.strikinglycdn.com/files/34870e20-2420-43a3-8b78-dd28e75c7eea/14799940328.pdf
    • https://uploads.strikinglycdn.com/files/72490398-242c-4b7f-9781-55b3e18364e7/7588631818.pdf
    • https://uploads.strikinglycdn.com/files/511fa0d6-75a8-4040-85a5-af387a4beb58/52250361414.pdf
    • https://uploads.strikinglycdn.com/files/82b92577-a4ff-4ed0-bdef-15d7640cd495/dagijenudamumowomu.pdf
    • https://uploads.strikinglycdn.com/files/bf86cd53-5f45-4b3a-8c3f-817661c7b702/nupojavupimir.pdf
    • https://uploads.strikinglycdn.com/files/5c240a89-253d-4f26-8356-93e61de1b7c7/xivimixudesujavu.pdf
    • https://uploads.strikinglycdn.com/files/800a97a8-f0f7-4081-be6a-34e4a7bd8207/budget_reports_should_be_prepared.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_off0000bab4.bin
50d691be35b893061e5d3ad27c62b3697c271c23ca79241835aa6bcdef92e5c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB4 5324 bytes
font_01_sfnt_off0000cc9e.bin
66a4a8b6acd963666c38316f282690604b6b600ed7091d4793aaa3d5dfb79921
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 10600 bytes