Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e451c23a9026b8…

MALICIOUS

PDF

79.2 KB Created: 2021-04-26 11:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 30423ddc29995d1969d86abca703a68c SHA-1: 046e4fb1f9d4b64d908c233632a714453aad0423 SHA-256: c1e451c23a9026b87c8e8379df032944e075102154c2dd381f514ede21f3d5b5
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation 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://xezojetit.ru/strik?utm_term=2006+bmw+330i+transmission+slipping PDF link annotation
    • http://pibofari.22web.org/platform_9_3_4_shop_official.pdfIn PDF document text
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/d1865c3.pdfIn PDF document text
    • http://difewemizotik.iblogger.org/7132092071.pdfIn PDF document text
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/dawezuxani_fozogedojalobut.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/pavefivaruwifutivimak.pdfIn PDF document text
    • https://dusitibepilezu.weebly.com/uploads/1/3/1/4/131437978/kuzapugixujoma_regow.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/cCzjiia/.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/fesabanukinu.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/ihZicYK/skylands_pediatrics_franklin_nj.pdfIn PDF document text
    • http://vuwagumewaga.iblogger.org/98161686432.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/jgiahds/directv_now_free_trial_firestick.pdfIn PDF document text
    • https://kigibituridugu.weebly.com/uploads/1/3/4/3/134352406/4743660.pdfIn PDF document text
    • https://cdn.sqhk.co/xikokopek/Ciemhb5/tovopopab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zimedexi.rf.gd/1752811993.pdfIn PDF document text
    • http://rulafiserize.rf.gd/53201909723.pdfIn PDF document text
    • http://rutefepojurew.epizy.com/35022089143.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_722fca4ced88407982d898aa4e1a72e6.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_ff51566c5c4a43b8bd7d5ccd4ce71650.pdf?index=trueIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_5273c4bf107d488b84f5577e873caebc.pdf?index=trueIn PDF document text
    • http://firuwasuwubo.epizy.com/dispute_management_reports_in_sap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 5536 bytes
SHA-256: b97000126883e6b34fd9fc7a66f0ad9f8a0eb3cbb27756d5c2e13c8dfa106ffb
font_01_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 10992 bytes
SHA-256: 92967b2de4cde4c72b7955a7489adf6dd698683e9f262dd624a5954a0ec3fdc0
font_02_sfnt_off00011f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F87 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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