Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade71ccd91b8fc88…

MALICIOUS

PDF

110.7 KB Created: 2021-03-16 17:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5a71a9f78b45bb848578a4d1778c10f SHA-1: 5919fab7b26ff7833c0bfa7aec58990a6ca352e3 SHA-256: ade71ccd91b8fc886ce32ab54398d6a3ce89635f3fa26f118b5ecd1132e1aeb7
186 Risk Score

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 0.9979

Heuristics 6

  • 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.
  • 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://botokaw.ru/award?keyword=pathogenesis+of+staphylococcus+aureus+pdf PDF link annotation
    • https://cdn.sqhk.co/dizukenepu/ibvijB5/recargas_claro_el_salvador_con_tarjeta_de_credito.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/2ade7.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/hGgjbia/monkey_king_ironheart_full_movie.pdfIn PDF document text
    • http://nature-ital.space/chemistry_tools_names_and_usesj3noc.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/ibChjjg/xoliputomoxuwagafavu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369333/normal_600043798f941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451742/normal_60317442d10a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_5fd3b49239553.pdfIn PDF document text
    • https://cdn.sqhk.co/buxisinuji/bjbvXvg/51936619781.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/VqrmOlE/real_racing_3_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/Ohgifij/freedom_of_speech_amendment_date.pdfIn PDF document text
    • https://zuzivosojix.weebly.com/uploads/1/3/0/7/130775151/muwamuje_jalitad.pdfIn PDF document text
    • https://cdn.sqhk.co/puxumede/NTTjaie/apps_store_for_android_free.pdfIn PDF document text
    • http://siteznakomstv69.space/emotional_abuse_easy_defck696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_602d46be5a826.pdfIn PDF document text
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/eda312313a7.pdfIn PDF document text
    • https://lejumapufa.weebly.com/uploads/1/3/4/6/134688193/a557e3.pdfIn PDF document text
    • https://cdn.sqhk.co/ditamozulipo/jfjesih/best_camouflage_skin_minecraft.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_bf54aafcc7984dacb988d7a37d6dd8e4.pdf?index=trueIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_adbcaf03b3194d8588a80dfaba6d1c0a.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_6628fbe6fc6e4542b9626962b7d0b882.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_f483ebbf24a24a6e93bff4bf9dea41ba.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_3102f2b0c41e4915bfd6100c566cb918.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D67 5520 bytes
SHA-256: bc7d33c365412c3e0c9ae7a994119f394c78dcab30ca268e0bb96fad9704d852
font_01_sfnt_off00017034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17034 11404 bytes
SHA-256: 5b69657549f0c2dbed93dccc036785609ffe8b04e5f8e3c2c4bc819ab78b8fa8
font_02_sfnt_off0001974d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1974D 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953