Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da517a5bb1e59bd…

MALICIOUS

PDF

71.6 KB Created: 2020-11-23 08:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 34df948b526fa53f0f6b01e014cf4fcd SHA-1: 2e34ba70147dcdb59fedc69e1e6dc392dc1bd2c4 SHA-256: 5da517a5bb1e59bdf986e2a0012857c853d4726dc1989bf2603f6d5b4e499c3e
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-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://traffnew.ru/123?utm_term=a+manual+of+style+for+contract+drafting+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413969/normal_5fad863adc56d.pdfIn PDF document text
    • https://retagavit.weebly.com/uploads/1/3/4/3/134363188/515886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5fb88f1145bbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_5fad81f660de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_5fab59af6528e.pdfIn PDF document text
    • https://bubamixidik.weebly.com/uploads/1/3/4/6/134657394/pijuvevaluto_garabifexiken_pofunixilitiw_kenowugisuzej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_5fa84e3d3cb5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f872e16dd183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5f9f350672484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f88d0fe6fb20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f88d37dec1cd.pdfIn PDF document text
    • https://movogabi.weebly.com/uploads/1/3/4/8/134881325/zomexila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5faa27e3a37e0.pdfIn PDF document text
    • https://gujibimusexuwub.weebly.com/uploads/1/3/4/0/134042380/ee7f00479064a.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/d7661e28-fa07-4c45-b41b-d166ed47125a/37716448191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f48133fc-9c6e-4683-8500-44d7e77ab637/gamusejubafetasi.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_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 5564 bytes
SHA-256: 3e0b4aa392ce4b6931df22b834b4259af9c6b241aa49ee114aee8a21f399be12
font_01_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 10824 bytes
SHA-256: 743168bec118a4dec00d5a422c5e2ca251668011ea8b8cb9dec1a57f8f58e1a5

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