Malicious PDF — malware analysis report

Static analysis result for SHA-256 a799527eb9d3c148…

MALICIOUS

PDF

74.3 KB Created: 2020-11-18 05:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d0386337d0d3d20bb6313b8f9b385126 SHA-1: 3882e8568badbcd8f3e89252e38ced1ec18ef968 SHA-256: a799527eb9d3c1482e344836e307a667f621b63800804260ebc3153ea3669ee3
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be related to customer complaints, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=bath+fitter+customer+complaints PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f8bcbd0015ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_5fa628d9e57a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5f9dbe485c69d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_5f9a99b687ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5f88cc420e2b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_5fb37bb277ba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5fa91eb87edd9.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/8f0c1c37-72ca-4f81-a89e-9e9f9314663c/57114685638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f6643c-0eca-4c6b-9d9c-88c92942c009/introduction_to_statistical_learning_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/661c38cd-0bc3-4f32-8ab4-b447f7c8d488/27419787620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14e17d6b-161d-4ef3-a195-56dbe5e0002b/77595230696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa4e17d-9e88-4210-a650-a1acd8bdd4a7/jakopuzuruxikubewawapot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6627ef93-686a-4453-881a-ea3a44900305/32186907675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/590cf0ba-1153-4753-9985-a2ae454bb99d/zemujuduxolopazusuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb57043e-39d7-4eeb-9ebd-686503e31120/dongri_to_dubai_marathi.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 5304 bytes
SHA-256: d3378a478baa0428cae2f6df348d935594fa05be818d9c3e8c706e5771323883
font_01_sfnt_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 11032 bytes
SHA-256: 4f3e894b863335be955964daa09e501136ad08f2c64073eb677b86546f311660

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