Malicious PDF — malware analysis report

Static analysis result for SHA-256 06450a5f4a4ba30b…

MALICIOUS

PDF

71.3 KB Created: 2021-09-16 10:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c95c8973278d1bf679f4ec920ffb590 SHA-1: a9df1d4a88f69b9993dd6a30e387bc70762aa7a9 SHA-256: 06450a5f4a4ba30bab80827a6099cf4a425a1ca0c5cd7193d415e7126dff2908
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.benyowsky.com/resources/files/vozis.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a60daa838---95956137281.pdfIn PDF document text
    • http://erex.hu/upload/file/2943282109.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/32393638315.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/domilow.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/70694263369.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/7116219688.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/53721607697.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/miwisezawiwonidukisejur.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/45479655538.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/nobapizi.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/luzutukef.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/kufuwetireri.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/74213153697.pdfIn PDF document text
    • http://parentini.it/userfiles/files/701342924.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/34177809489.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3ce93d2c---jurefaziwuwatipesisowi.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/wisofatazusurugilaxujorez.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/manimivosaxuvupakuwulukir.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613986deb5dab---24127704132.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/86432864195.pdfIn PDF document text
    • https://kawanmto.info/contents/files/lelegoninulegale.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109130301142684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+u+know+if+your+iphone+is+hackedPDF link annotation
    • 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_off0000b800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB800 10956 bytes
SHA-256: cc014b55db606503bbda7cfc765c605aea32166b3b0993be75de50d369f0998e
font_01_sfnt_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 15260 bytes
SHA-256: 2932166fe99c01ace5533a2ff42dacdfd0459350f11b8a165f88ec437a798807
font_02_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1