Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50a57c13bfe108b…

MALICIOUS

PDF

73.4 KB Created: 2020-11-10 09:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87dfa0e67bb9d5d61de3e7b7f06639a8 SHA-1: 9bd64e61b245bec6dcf789abde4d3503ed7640cc SHA-256: f50a57c13bfe108bdf55a365e3f7025c678342e6f1c2987c91d438eed7a65943
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains an embedded URL that directs to a suspicious domain, likely intended to host a phishing page or download a secondary payload. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?keyword=old+blanchy+wow+classic+server
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f9b5f38c1e41.pdf
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5f90f7e5c60ad.pdf
    • https://cdn-cms.f-static.net/uploads/4388405/normal_5f9ac8785a298.pdf
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f9cd79a7a6e0.pdf
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5f96963716036.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dbd37d75-8441-42a9-a420-ede9e632c055/baxajulajizin.pdf
    • https://s3.amazonaws.com/fedufiporara/south_carolina_notary_public_reference_manual.pdf
    • https://s3.amazonaws.com/gorajikunobixi/2780730327.pdf
    • https://s3.amazonaws.com/sazariwapa/79828218047.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_off0000d980.bin
5fd6c20b8aac38665b0f57657b8b83195271966faaeb50d7465fe644cb838bc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 5448 bytes
font_01_sfnt_off0000ec17.bin
96ef10cb3393c59e07a0ef03afc8f65838386f86f2bf88af0b8c63eb44eb992e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 13908 bytes

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