Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b11505ec0c9f4d…

MALICIOUS

PDF

85.7 KB Created: 2021-06-02 04:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c327fe3647ec0762fe06886e59ccbeaf SHA-1: d9a8a3daaf7cebf2e7c0997455747ba8336c242f SHA-256: a2b11505ec0c9f4d7e5c50052b099032b2c3808bd08d7aa454b86f37d1da6450
126 Risk Score

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 0.9993

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 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://jumiwimov.ru/123?utm_term=worksheet+on+laboratory+safety+rules PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476127/normal_5fdee75bb4e42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463565/normal_5ff4daeb560d0.pdfIn PDF document text
    • https://malugerimume.weebly.com/uploads/1/3/4/8/134846891/9015338.pdfIn PDF document text
    • https://nozasereb.weebly.com/uploads/1/3/4/4/134499995/266034.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377113/normal_5fed4681ab589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391611/normal_602b9a661d0fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_604d043235566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_602b02fa13036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_6059e58556187.pdfIn PDF document text
    • https://nowujokawaj.weebly.com/uploads/1/3/4/6/134676947/nuvutupebegon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_60164bcae3c9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490529/normal_60687b6e4ac00.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/7f50e3e2-1660-4bfe-a5d2-071ea037bcae/wixoledolazode.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/f/caracteristicas_principales_del_modelo_atmico_de_sommerfeld.pdfIn PDF document text
    • http://xawaren.pbworks.com/f/6794128161.pdfIn PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144454134/xoneduverigaparabaxebite.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/teoria_constructivista_de_piaget_vigotsky_y_ausubel.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/w/file/fetch/144484035/whats_my_spirit_animal_totem.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/best_mcq_book_for_neet_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68a6751-efad-4611-89d2-28c0d84ba568/how_much_does_it_cost_to_install_a_dishwasher_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b7ff79-7026-4c5e-8366-a68ca261965e/how_to_show_post_thumbnail_in_wordpress.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/w/file/fetch/144484554/how_to_learn_python_programming_language_for_free.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144420741/exercicios_termos_integrantes_da_orao.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73f29ef-ec33-440a-8a56-e8acd0be749d/earth_stove_1002c_manual.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_off0001113c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113C 5172 bytes
SHA-256: 5c6fe81d8b9b077ac3c99c6e037e8e9a80edde960322c68f84ad5a02730a4861
font_01_sfnt_off000122e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E7 11824 bytes
SHA-256: d9f774cc643fc343980c422e13667125aa581331e920f6efdeada872224c88f2