Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cb8a8d5ee6e032…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 18:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38808f5eb1fa0e4ef581c05678ee56da SHA-1: 8aaf42c5d20a33b15d17f01eff0736142ff5e8c4 SHA-256: e4cb8a8d5ee6e032c514150374b076a0f5122615e54d606bd555c2d93a55ccb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=automation+in+microbiology+laboratory+pdf PDF link annotation
    • http://clinicaveterinariasangiacomo.it/userfiles/files/31750686721.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/59985183946.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/jesutuwelinozedomatule.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/fisekewusowagumiju.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/gudopofe.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/robujagidedunuxasaximuji.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/jutowup.pdfIn PDF document text
    • http://taociren.com/upload/file/210904235217947002rbsu0pw4xtgy.pdfIn PDF document text
    • https://palet-school.com/files/files/81315005720.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/5545911229.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/pavijosu.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/99669172559.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109071255253139.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8cc1d8b25071d288e0d6ab97031ee33/fawem.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/79040171771.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/dotumeganaluvopukamote.pdfIn PDF document text
    • http://uco-kampen.com/media/files/pudibevugeredakigadunu.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/rojepudo.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/basuxabelivowodi.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/6286566675.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/zijifanaga.pdfIn PDF document text
    • https://ubranni.com/uploader/files/wapupivizejewijit.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/gibazobitoxurukawi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFF 10996 bytes
SHA-256: 7a7f2a8f0178eab84e4ef586d4ad2ff5f87278a5ca287c55a9ff10f2c2d50ce3
font_01_sfnt_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 17512 bytes
SHA-256: 0f4acb26430a8a3373f3717cbb3a33ce00b04e0dd0782dd39b7527837f88ec7c

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