Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a160916fa23a4d…

MALICIOUS

PDF

64.2 KB Created: 2020-11-26 16:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5d2518ad251e9a6a43e6734c23d2263f SHA-1: d2feecd2e8a42ee22ed5325706bd3a36cd222430 SHA-256: d7a160916fa23a4d4f7c4da9afea89f7945ec1f2ce94244b3942cf1c07305c24
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://trafffe.ru/123?utm_term=skeeter+boat+center+war+eagle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450723/normal_5faf8fb5186db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_5fadd404b4a98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5fa309ef1f2db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5f8aeb8b11ec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385848/normal_5fad57f54d13a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_5fb372bad0e3e.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/fifoxu_kedakavazaba_luduvodinemin_gezajotox.pdfIn PDF document text
    • https://ketawajizaw.weebly.com/uploads/1/3/4/5/134528489/2364282.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/e23516b0-02b3-43fb-8269-a0dfb4a75f22/juwanev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde94d10-c434-40c2-8d2b-ed42d0897946/zijig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a69da69-2b77-4771-a275-a9a95c08747c/madera_tratada_minecraft.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/76907414481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c6e11f3-f350-4e51-9b28-ec18ac822360/pofutixironaf.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_off0000be0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0F 5188 bytes
SHA-256: 3c7cbb049ec7255900c60838c46cd55faf5a39f692e8e0fb10fc3f5948fa4d6f
font_01_sfnt_off0000cfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE0 10636 bytes
SHA-256: a80c75d063d4c1ed885edb3eed19e1fc24df8a7cf479806a79c7d49234ae843c

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