Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c786380acb6ab07…

MALICIOUS

PDF

83.4 KB Created: 2021-03-23 04:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bb6c0d1182eba7e9cd627f225f85293 SHA-1: 7b820d64090405111af0570b602d721f5251201c SHA-256: 9c786380acb6ab0721cb8c33a7873edc1e8015d4bbc64f65e90d04f2ec32312f
166 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests a business email compromise tactic, where the document likely contains links to fake payment or banking instructions. The presence of numerous external URIs, many hosted on disposable domains, further supports this, as these are commonly used for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://mezovuduw.ru/wix?keyword=multiplayer+master+for+minecraft+apk
    • http://suwufexez.sportsontheweb.net/10953074632.pdf
    • http://naliputa.mywebcommunity.org/vukakoroxaledifaropinuza.pdf
    • http://xufamorazogubov.sportsontheweb.net/7th_chords_piano.pdf
    • http://mikovil.mywebcommunity.org/gakufuzojitililokimeni.pdf
    • http://neditaxuvim.getenjoyment.net/lerobikumudinilam.pdf
    • http://vuvulusigi.scienceontheweb.net/aviculture_maroc.pdf
    • http://zumanidoxup.medianewsonline.com/does_britax_clicktight_have_latch.pdf
    • http://dejepuzalew.mygamesonline.org/les_amplificateurs_oprationnels_cours.pdf
    • http://tikopariwoxa.mygamesonline.org/oxford_picture_dictionary_french.pdf
    • http://vodabutopidaru.getenjoyment.net/pdf_bookmark_software_free_download.pdf
    • http://lorakuze.sportsontheweb.net/sociolinguistics_peter_trudgill.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lebejos/asus_bios_update_missing_operating_system.pdf
    • http://ralirajuz.atwebpages.com/moxufisanit.pdf
    • http://tuwutexo.onlinewebshop.net/xefebisupokapujanono.pdf
    • https://s3.amazonaws.com/lewuli/where_are_marathon_watches_made.pdf
    • https://s3.amazonaws.com/vapelurowar/sovazorujerebonot.pdf
    • http://tikomiwewo.atwebpages.com/everyday_business_writing_english_for_work.pdf
    • http://pobuwejugu.epizy.com/employee_engagement_survey_template_surveymonkey.pdf
    • http://teluroluxeterez.myartsonline.com/53460145199.pdf
    • http://zomekijisev.rf.gd/bible_quiz_and_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ab.bin
93c2626867a0b711f4f858503e68c5d8f5eca12ac99b40286e4dea63f80856e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 5332 bytes
font_01_sfnt_off000105d1.bin
6026aff3ce9469b8b5ac6a1aa5d76029f448b636c3ca58609a2ca5d121d26bd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 10988 bytes
font_02_sfnt_off00012b58.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B58 16092 bytes

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