Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3f4cc713109b2f…

MALICIOUS

PDF

78.9 KB Created: 2021-04-11 05:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 12524dabec34ed8e18b552b56095ba26 SHA-1: c7471c5245ceb02a5d94fcb0eb2c915f8444343b SHA-256: eb3f4cc713109b2fb95ef93896f90cda176d8935cd9eca98c8b9e99531190aa7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links to disposable hosting, suggesting an attempt to obscure the true malicious destination. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, suggesting it was generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=how+tall+is+a+18+cubic+foot+refrigerator PDF link annotation
    • http://lenexobut.22web.org/pentagon_hexagon_worksheet.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/probability_vs_non_probability_sampling.pdfIn PDF document text
    • http://esclick.pro/96978500207gcl6o.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/98568687098.pdfIn PDF document text
    • http://iuts.space/8362951763576g9b.pdfIn PDF document text
    • http://siankaanmexico.com/448107196333ccyx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5ff58ba2a2af8.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/50_ways_to_become_a_better_speaker.pdfIn PDF document text
    • http://demumamudu.22web.org/zurirobogegosuberafuwelug.pdfIn PDF document text
    • http://kebenoda.scienceontheweb.net/10696601720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_60282908d88d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitejilid.epizy.com/59818437303.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_b24ba8d105d64041bf8faa0d82284633.pdf?index=trueIn PDF document text
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_b00fabb31015480086a1df87ab126086.pdf?index=trueIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/bass_guitar_training.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_d521734f2a844a078d2e7657300d01b0.pdf?index=trueIn PDF document text
    • http://wagagufogubejal.rf.gd/bossa_nova_guitar_book.pdfIn PDF document text
    • http://xijejuvi.myartsonline.com/impulse_turbine_velocity_diagram.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_7624a9f9e77643d5b741f6a24cbe0ae2.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_43f097ec3edc40edafc81e28733a34e0.pdf?index=trueIn PDF document text
    • http://wififeju.atwebpages.com/pamewosuxudonisunez.pdfIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/cahier_de_vacances_maternelle_gratuit.pdfIn PDF document text
    • http://wopojofa.atwebpages.com/short_alcohol_withdrawal_scale.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_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 5488 bytes
SHA-256: b95ea1618a181686308500d3aea2f3e8f510c089a80c70ce0c99d931a49613ad
font_01_sfnt_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 10572 bytes
SHA-256: 743f4a647da39d109da2752d28f45038c22778601d9cbef62e6daef98f8deb42

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