Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a6db4703ef6983…

MALICIOUS

PDF

75.1 KB Created: 2021-04-07 13:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: acb25663944f207e24c481d33e6f1a1e SHA-1: d42163003a7b67fd00a29cf9ced3d35871be8fdb SHA-256: 21a6db4703ef6983f5791f83d9a90cf7cbd51189b70ac80f8dc6b36883c0ac8e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing unwanted content. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=how+much+money+is+david+attenborough+worth, which is likely used to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=how+much+money+is+david+attenborough+worth PDF link annotation
    • https://cdn.sqhk.co/noxisoture/ZPhc15t/29640250538.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/jjdif2Q/70813617874.pdfIn PDF document text
    • http://bajesiradevo.getenjoyment.net/bilirrubina_en_neonatos_valores_normales.pdfIn PDF document text
    • http://waliduv.mypressonline.com/anchoring_script_for_farewell_party_in_college.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/kozufadalabikuv.pdfIn PDF document text
    • http://tebogekememesij.mygamesonline.org/demexifadeb.pdfIn PDF document text
    • https://xajadigosulibab.weebly.com/uploads/1/3/4/6/134650053/8710575.pdfIn PDF document text
    • http://juxowupekabaf.mygamesonline.org/duxidovaja.pdfIn PDF document text
    • https://falugasotemo.weebly.com/uploads/1/3/1/4/131410545/8741587.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/oheXI6c/install_ftdi_driver_ubuntu_18._04.pdfIn PDF document text
    • http://wisomudo.iblogger.org/60868592433.pdfIn PDF document text
    • https://xibagepop.weebly.com/uploads/1/3/1/4/131438114/8731812.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/0Kgihc3/amazon_store_card_services.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_01a85237266646eab886cb37171afcb0.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_006289d6bd44478883a346c2d4e76d71.pdf?index=trueIn PDF document text
    • http://jazajebexixe.epizy.com/birthday_greeting_card_design_template.pdfIn PDF document text
    • http://bikevobo.rf.gd/28838105127.pdfIn PDF document text
    • http://lorenivi.rf.gd/binary_subtraction_examples.pdfIn PDF document text
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_d74cb83b7e4242de9cb62a41574ee35a.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_3c745fa3f0044ebeb44cb967261131bb.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 5676 bytes
SHA-256: 4ac9c9889867dda29983ea413e7314eca4922299c9167dbd9388cbe78885df43
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 10548 bytes
SHA-256: 63fdc92dcde07c5b9239de47444c1f4821c616ed2f3a88ad1e822bc7adbd6735

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