Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97c13c5da3bc826…

MALICIOUS

PDF

75.3 KB Created: 2020-12-30 05:24:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 005b21ac9a37579619c550d71ae277f3 SHA-1: 908a728dc8833303afe2c6f9a439e58bf33bd1c2 SHA-256: f97c13c5da3bc826869c92f7d86e2d0e1665f5fce7d3fc28be656c372189906c
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/strik?utm_term=photo+video+editor+with+music+download+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424328/normal_5faea14fa9d3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f9dc0fd8b205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5feb25eba67d2.pdfIn PDF document text
    • https://sugabora.weebly.com/uploads/1/3/4/3/134369176/7407908.pdfIn PDF document text
    • https://lodoxaravejow.weebly.com/uploads/1/3/4/7/134719504/8318d0824841f.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/vozubufazusemapu.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/7d7b6617ab8.pdfIn PDF document text
    • https://cdn.sqhk.co/lawikuto/ahhWWif/bobirekusurerakevar.pdfIn PDF document text
    • https://cdn.sqhk.co/dorusafe/ghe0jgc/amazon_kindle_library_books_uk.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/vixuxig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422890/normal_5fde8fa96297f.pdfIn PDF document text
    • https://cdn.sqhk.co/doxutijewu/gjzKhf6/bosunanofotujodif.pdfIn PDF document text
    • https://cdn.sqhk.co/pidefatop/LA7aFgi/telehealth_therapy_jobs_california.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/tazujejegogaxiroxafi.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/81478188270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b0ac32-689a-400b-9295-3597bc95a4a3/american_history_1_unit_3_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e4ce8c9-fd09-4272-acba-143f258d64ef/55517302527.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 5464 bytes
SHA-256: cda8ec77ea8074adddf06f6bde9163212776f3a8e8c6dc8c9ef1e44bf00f2435
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 10824 bytes
SHA-256: 11f2471bb0269da98fde2642d528c5314f7f3adc6ec2b43a82ed78f86a3852bf

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