Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd4eca25632c426…

MALICIOUS

PDF

71.0 KB Created: 2020-11-10 23:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 54aa1eca4bce6720f679e9be5f7c9afc SHA-1: b82bb477dc128b53e0bc844c66dafb2c2d96150c SHA-256: 8cd4eca25632c4268af656667e95cc38dfbd44eb9d20d153a0ef5c976b5bb8e2
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URI are indicative of a social engineering attack designed to trick users into visiting a malicious site.

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://trafftec.ru/123?keyword=cell+structure+and+processes+crossword+answer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5f95868490855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_5fa89efe8b38a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5f95817f81808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_5f89254f6ee24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5f96e9a89518b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f8c8d8d2d272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/595e3c37-7b0e-4597-aae7-6d6ec33e7443/bebowikimefijukigapoguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f906fd4-71db-4392-92c3-e830e4302b8a/15610228724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c0a7d9-b2d6-468f-abb5-c62c62743e9f/33073005908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cee2209-94d5-4e08-bbf7-72e65069ba26/golden_gate_cloning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d7f504-3e0d-40c8-a411-7f99c58d9318/3425492918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561ec7d4-c720-4fae-8f98-9f705432e9c4/wiluzamimabokib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94abbce5-7504-4c97-820d-9da1c1494076/lalijodoguxuvunasini.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 5016 bytes
SHA-256: a940abd2b2b6d7e7cfdcfe4dc24480d425764cfe8b6f7cc968c3139c4c689c58
font_01_sfnt_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 11832 bytes
SHA-256: d675bb2037aa316dc641599b2701758d328dbe43d2550dfbda8eda75e9d1e54d
font_02_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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