Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83ba80f96a4eb19…

MALICIOUS

PDF

78.7 KB Created: 2020-11-25 07:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4fef890ab8d39453bea7c018befda44b SHA-1: 9beda1458f5bbc2cf6342f9b203db232f5a87aab SHA-256: d83ba80f96a4eb19afdeeb5c6963e5677edb7ec19f27a98fc6ca3ab4db06dccf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/strik?utm_term=5.1+puzzle+time+answer+key+algebra+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415061/normal_5fb603b3f3063.pdfIn PDF document text
    • https://patelevenimo.weebly.com/uploads/1/3/1/4/131437444/felasonoki.pdfIn PDF document text
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/6115800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421051/normal_5f982366e2887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_5fb53871451c1.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/bcc61019-1792-473e-b0eb-6b043f3d04cb/vusujedawosegaxezarozidip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebff83b5-e934-4240-9235-6c9b00572291/17748443678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cef65c9-67f9-4cb0-b350-113d2eae2183/felagezizefaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e9e1be-360d-434a-b5ae-f20cf1ec50ed/perfumes_de_marcas_baratos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ab01537-c6fa-4d86-8707-cc9c7a63ba7a/primo_levi_survival_in_auschwitz_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7432a00-ed96-4bb2-b8d7-e534b53e62dc/sunevivifeneni.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_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 5700 bytes
SHA-256: 74a1e3fe776bcb3766cf8d63092f9b2a02e26f12f9545c102408051fa79a7e68
font_01_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 11224 bytes
SHA-256: 9bab6a0bf295e740472d54d518cdeebfc38c775944de93a782089f28e556807c

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