Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf948f463f00fe94…

MALICIOUS

PDF

71.7 KB Created: 2021-10-04 04:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 178bfb1a85c5c539dea073ca35b87610 SHA-1: 5f01852646b55de15e001adcc8ef699f8805cbbb SHA-256: bf948f463f00fe94e48f8c714930d6f2d0d2a5354a9c7116c003127fdfbf1e04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, which is characteristic of link farms used to distribute phishing content or redirect to malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/65701762277.pdf In PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/satekut.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/rokabevolokuv.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/81707119309.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/maziloxusowasisevikosu.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/puvesawafufebuxadopa.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/47404572752.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/dutupuwejexunimavusu.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/40260760640.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/11985787318.pdfIn PDF document text
    • https://razredna-nastava.net/files/73770628583.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/94709834223.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/42165564254.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/risogoxuvozowabapukigopu.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/wojisomijurorijo.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/vozosolelepe.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/bulokofamofubagilotegas.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/73203991857.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/sitijekopelogeno.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/gejojulorovosew.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/54607821284.pdfIn PDF document text
    • http://falconltd.pl/cache/file/17508585359.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/85610687066.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/vewag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+legend+of+bhagat+singhPDF 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_off0000b2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AA 10636 bytes
SHA-256: 6b3ab5e1a0dd32807e7e96667def1e08c04994a0aa0ae56736ed7090430b3a5e
font_01_sfnt_off0000cab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB7 18076 bytes
SHA-256: fb98e2eff1a6b930e162f605bb8ccf60ee4c26349a31282d4a34556ee5911e13
font_02_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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