Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c8b31bac98336a…

MALICIOUS

PDF

82.0 KB Created: 2021-04-14 07:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 269c735f77cf506b651285aae1f96908 SHA-1: c6675fa4e5246741b9080310dc9387e91a558b4f SHA-256: 90c8b31bac98336a2c078cbe4076d812dabf1f834854680795f21eee4bdb6891
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 0.9991

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://fokemale.ru/strik?utm_term=cien+a%25C3%25B1os+de+soledad+frases+importantes PDF link annotation
    • http://snt-br.ru/what_is_the_plot_of_thank_you_ma_am_by_langston_hugheszxe57.pdfIn PDF document text
    • http://misstourist.info/31826558108lku1l.pdfIn PDF document text
    • http://hookup154.fun/spandana._ap._gov._in_application_form5ovo8.pdfIn PDF document text
    • http://student-yurist.ru/72055615196rf3ge.pdfIn PDF document text
    • http://dunewewibi.22web.org/apple_airport_express_manual_reset.pdfIn PDF document text
    • http://gexafozo.22web.org/54549873414.pdfIn PDF document text
    • http://mabay.fun/2116044739312ima.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://momobolabewonu.epizy.com/pafani.pdfIn PDF document text
    • http://tativukowodugox.epizy.com/what_are_some_traits_of_a_good_manager.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/23460918098.pdfIn PDF document text
    • http://zivuvosiz.epizy.com/38088897242.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_b8a8a081937d4f44a40dd4934a1058ab.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_85f1d1a4e9d5486c944a852600683fbd.pdf?index=trueIn PDF document text
    • http://metukobitoro.rf.gd/access_archived_facebook_messages_on_android.pdfIn PDF document text
    • http://raxaxeve.rf.gd/share_market_basics_for_beginners_in_bengali.pdfIn PDF document text
    • http://jebefufodapiwi.epizy.com/fundsmith_equity_i_acc_fund_factsheet.pdfIn PDF document text
    • http://fabupumow.epizy.com/camera_gadget_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/volatility_commands_cheat_sheet.pdfIn PDF document text
    • http://wafinumufi.epizy.com/acuerdos_de_paz_guatemala.pdfIn PDF document text
    • http://xosareregaka.epizy.com/melefekajaxexegowemovud.pdfIn PDF document text
    • http://getetir.epizy.com/almonard_fans_price_list_2020.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_615e8aaf88d941a788c526fa493f8bab.pdf?index=trueIn PDF document text
    • http://gajutovowitexij.rf.gd/62115533118.pdfIn PDF document text
    • http://gozosowizopuk.rf.gd/baidu_translate_english_to_chinese.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_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 5304 bytes
SHA-256: 46e37a33fd2daef3d1cd0ce09b172ecb9299cf849b50116450e42f885fe58b80
font_01_sfnt_off0001124e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124E 11500 bytes
SHA-256: 91f35e7a2399e619cea571a9d9f8d986ad930d1797eeef757292b5335f799998

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