Malicious PDF — malware analysis report

Static analysis result for SHA-256 681d96cf16783371…

MALICIOUS

PDF

76.6 KB Created: 2021-02-23 13:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ed2046614e5546e3c42fb6c3cc29da7f SHA-1: 67c797c902f90493038653e602c206879859b478 SHA-256: 681d96cf16783371e7b4c01e819f69c3c48c657c2f00674f089c4d361b1e46bf
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as an external URI and flagged by a machine learning classifier as malicious. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded URL is likely intended to redirect the user to a phishing site, masquerading as a game guide to encourage clicks. No scripts were extracted, but the PDF structure and embedded URI strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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://leonvi.ru/wix?keyword=darkest+dungeon+final+dungeon+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473053/normal_6010ff61da261.pdfIn PDF document text
    • http://fitokapss.xyz/866004137297con3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478430/normal_5ff5e6fff1f7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451545/normal_602e43ecc2751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_6008cd82219bb.pdfIn PDF document text
    • http://trenolgia.buzz/cpwd_telephone_directory_2020u0jl1.pdfIn PDF document text
    • https://cdn.sqhk.co/zetobazox/A1hije6/79306080005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489593/normal_5fe72fb2b9daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_5fdb9ad8c8c36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 5140 bytes
SHA-256: 3172decb56ba4f946ea6ed6229c39ab1adbe0b8b454bf88a8d59b44def0f10c4
font_01_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 10572 bytes
SHA-256: b12c466c0f6c4ab964c44cf8f57b65e62985ff6bf60ec7994c2b6f12063bece1

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