Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0d4ac101f97011…

MALICIOUS

PDF

68.2 KB Created: 2020-12-05 15:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 776918f5b3f180a3fe38cdc69aa91939 SHA-1: e27a9eca50998771b03f76a13b361256f84fd865 SHA-256: 1e0d4ac101f970118ea1c83dd8d4d0fd90b60288e83ea4904f36031b46556114
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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?utm_term=visual+studio+2013+tutorials+for+beginners+pdf PDF link annotation
    • https://relugudikovok.weebly.com/uploads/1/3/4/2/134265752/945a9fb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_5fbf85e5c2553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457320/normal_5fbcaa94687cd.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/3289848.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rezareludufiven-voxodopi.pdfIn PDF document text
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/4004344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_5f8aa9e36e21f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5f96dffd2fe9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422627/normal_5f9b5392adb0b.pdfIn PDF document text
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/996f30.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/7ec8d6c9-d10f-4ae5-a601-29f73c29eb32/nitoguwarasabum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96dc7322-3416-4576-a016-dd5a716a8372/sudagivoxeseg.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 5804 bytes
SHA-256: ce90f6d2d010035307a6a2d2f33139d9f9121caea4faa0b7412aebb391c4b7da
font_01_sfnt_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 10152 bytes
SHA-256: 12ea3db2a782634191321d21d0c5193fa47a99ec20cae276a870ef6e1442bd94

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