Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8da3d621933dfa…

MALICIOUS

PDF

72.7 KB Created: 2021-05-13 17:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 31dadbdf153cec0f44b4314a7ebe0b0c SHA-1: 1bd645f1d13f0e5b69f7c650d6c86a88f5b7514f SHA-256: 7f8da3d621933dfacbb3ac4fc0bbd69a9fc648a53466bdc664d79e5b034be18e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://kuzutuzo.ru/strik?utm_term=best+book+to+study+mathematical+statistics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410433/normal_60061da65de6f.pdfIn PDF document text
    • http://jikitosot.22web.org/xitoxetobe.pdfIn PDF document text
    • http://tixaman.scienceontheweb.net/bruxismo_causas.pdfIn PDF document text
    • http://my-favshopf.online/formula_1_2020_xbox_one_asdam2w01.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/kenmore_washer_repair.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/pdf_text_editing_software_free_download.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/91336972301.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495985/normal_5ff3227ba663a.pdfIn PDF document text
    • http://bobatukuxoto.iblogger.org/ceo_telangana_form_7.pdfIn PDF document text
    • https://bebilakag.weebly.com/uploads/1/3/0/7/130776425/jukoxirowoxi.pdfIn PDF document text
    • https://tozisodije.weebly.com/uploads/1/3/4/4/134486105/3518cafed2b.pdfIn PDF document text
    • http://legko.travel/473173356225r88j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5ff416d9c94fc.pdfIn PDF document text
    • http://nafewid.sportsontheweb.net/biochemistry_carbohydrates_questions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://romepasuv.myartsonline.com/digital_circuits_interview_questions.pdfIn PDF document text
    • http://vobozezojip.onlinewebshop.net/reduce_file_size_adobe_acrobat_standard_dc.pdfIn PDF document text
    • http://tamevebuzonufi.epizy.com/70691515351.pdfIn PDF document text
    • http://bejanifezilo.atwebpages.com/parokiwigofumabol.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/areopagitica_john_milton_espaol.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_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 5440 bytes
SHA-256: a2d488f5b9d6e885569fa82cd4645479a9048392448ddbfa88c6a43282f37b2c
font_01_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 11296 bytes
SHA-256: 293bc1c61d07a184e1ffab88a94c6dbb2c363bc675547d27e664bedf7cb0d5cb

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