Malicious PDF — malware analysis report

Static analysis result for SHA-256 af75ded12ccf1634…

MALICIOUS

PDF

77.7 KB Created: 2021-03-31 03:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 235e6259e89952419a8698f20890ae25 SHA-1: 51f0e2f428e307ebe3e4f6657c75ba187bac8e1b SHA-256: af75ded12ccf16347d412877555a8ff48abc53bbacc64dfa408a0009eee2d9cf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://zajinet.ru/strik?utm_term=merchant+of+venice+act+2+summary+sparknotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449774/normal_603725bba4524.pdfIn PDF document text
    • https://vejexuwelukilik.weebly.com/uploads/1/3/5/3/135340180/9475513.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/curso_de_ingles_gratis_descargar.pdfIn PDF document text
    • http://timinome.getenjoyment.net/588670705.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/how_does_a_central_air_conditioning_system_work.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/gavagorapu.pdfIn PDF document text
    • http://gewusoluxul.scienceontheweb.net/24505521134.pdfIn PDF document text
    • https://setinedib.weebly.com/uploads/1/3/4/6/134684411/5582296.pdfIn PDF document text
    • http://front-glass.space/41827344191lni2j.pdfIn PDF document text
    • http://sellforce.ru/fuzuzewasate46x45.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/important_constitutional_amendments.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497368/normal_5fff6112c1b97.pdfIn PDF document text
    • http://loxiturizule.sportsontheweb.net/sanitary_inspector_book_in_gujarati.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/32ac255f-6cb9-46eb-b2d4-ddf013ac80d4/american_gods_season_2_episode_6_full_episode.pdfIn PDF document text
    • http://zodiripek.myartsonline.com/generative_adversarial_networks_projects_kailash_ahirwar.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/nugutajatufetemuxatalabaw.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/tratamento_da_pneumonia_bacteriana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580f2b26-5d7f-43d5-be5d-821eef4c2cb2/72860728582.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/domabutavogenafuxan.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_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 5588 bytes
SHA-256: 36a391e1fd51d5c41cf94003218c5db751ac85791af9e642761b6dc22e2ae497
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 10332 bytes
SHA-256: d76ad9751f9280c0343384b96f14e9b17ed9391cad081864b7156ac2c4a2c232

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