Malicious PDF — malware analysis report

Static analysis result for SHA-256 31238ee9c8a3f476…

MALICIOUS

PDF

74.8 KB Created: 2021-03-30 22:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 31a829b77e5c54b559ce23cec0139694 SHA-1: acde98d5c4069d2ad3e0575476067e58c05b2b87 SHA-256: 31238ee9c8a3f47650b75996bf02bdcfa4dca70809a37c1e81a0ddfa7c515433
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. 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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://dajepulexito.weebly.com/uploads/1/3/4/5/134591334/6791695.pdf.
  • 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://crophysi.ru/strik?utm_term=how+do+i+get+my+1099+from+ssa PDF link annotation
    • http://najelipopusivut.getenjoyment.net/2012_polaris_ranger_800_service_kit.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/bupekuzipiwo.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/2.0_tsi_vs_3.6_fsi.pdfIn PDF document text
    • http://snail-case.store/savonev2qvt.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/steuer_anlage_kind_2020.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/xosudokigimareku.pdfIn PDF document text
    • https://dajepulexito.weebly.com/uploads/1/3/4/5/134591334/6791695.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/dave_ramsey_budget_forms_spreadsheet.pdfIn PDF document text
    • http://gudutisiluzew.mypressonline.com/augmented_reality_paper.pdfIn PDF document text
    • http://lyudi23.ru/suwojaxekort70j6.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/wexorinaxeme.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/23751877856dl8m4.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/tepibowilixajagiwor.pdfIn PDF document text
    • http://streichpack.online/bose_companion_3_series_2_weightk7fh0.pdfIn PDF document text
    • http://bulakirip.getenjoyment.net/fuvad.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/patanjali_ayurveda_books_in_english.pdfIn PDF document text
    • https://denalozi.weebly.com/uploads/1/3/0/7/130776502/xokege.pdfIn PDF document text
    • http://torixobo.mypressonline.com/berta_isla_libro.pdfIn PDF document text
    • http://biotringel.shop/sejovutajojixopesarobexukl4n1z.pdfIn PDF document text
    • https://lepifokofufup.weebly.com/uploads/1/3/4/0/134018260/144531.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/vimuzodatixogesawuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3719aa01-1fe2-4e90-b7a2-a571abd95665/63711709534.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/nutevaviz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c91595-3710-4046-9d18-20333e9be1a7/parew.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_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 5700 bytes
SHA-256: ba12c4010d27268e9d9850d9fc92cefc92972589e338d6b0efc96b30204840f3
font_01_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 11412 bytes
SHA-256: 14e50e4826aad52a6047b626e19d4c1f61f7d7a042b997345936a8972a361bc6