Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b27a2699faad4fa…

MALICIOUS

PDF

79.0 KB Created: 2021-04-16 03:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5b473ebab556a53856a221b20a03fac1 SHA-1: 26ddbf96b55ca5c31e53d8237b0a523128160eff SHA-256: 0b27a2699faad4fa953f763314d45b241fbe9fa6d18a5a9313199a83bd41a099
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it is part of a link farm or designed to redirect users to malicious sites. The primary external URI observed is https://soxebez.ru/strik, which is likely used to host phishing content or distribute further malware. The PDF structure itself is also suspicious, with duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://soxebez.ru/strik?utm_term=dewalt+xr+drill+set+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390074/normal_5fd5efe3c17d3.pdfIn PDF document text
    • http://dusosax.66ghz.com/64434019851.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fc7c558c865a.pdfIn PDF document text
    • http://pukogika.iblogger.org/9th_grade_word_list.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/51100381022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_6044d7967b578.pdfIn PDF document text
    • http://fitoxis.22web.org/the_cakemaker_2017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471948/normal_5fdec5c087fe7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421217/normal_5ff9948e6bb40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://josesawi.epizy.com/preguntas_ser_bachiller_2020_resueltas.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/boondocks_season_4_full_episodes.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_22fac13adb534d2ea57e87966adcc550.pdf?index=trueIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/laporan_pendahuluan_fraktur_antebrachii.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/olympus_flexible_endoscope_user_manual.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_5853f63be3914772a547497c3767e2d6.pdf?index=trueIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_1c8babd0b02746918544050a437c1e51.pdf?index=trueIn PDF document text
    • http://mevuxuru.atwebpages.com/abkari_risala.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/is_it_better_to_eat_breakfast_or_do_intermittent_fasting.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/tufegemutezadusovefezelo.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/iso_9001_version_2015_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/nawikuz.pdfIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_318b2d28586e43de9e7f118c3dafef0f.pdf?index=trueIn PDF document text
    • http://vibiputis.epizy.com/fubixaw.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/zagilefu.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/ramivimal.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_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 5040 bytes
SHA-256: 9cf545dba832d5e4b6319370f6f8c0977d36304b224c2b2a76bc2721fa697868
font_01_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 10888 bytes
SHA-256: ac71d1adc75389078eb792948303077b8cdbf7a7f660a87941b2574d3f758669

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