Malicious PDF — malware analysis report

Static analysis result for SHA-256 a478ce9181667537…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 03:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea69d20605637f3fd55d0cf51b60ae19 SHA-1: 72862c48322ec5f3c4c2eb0dd4bb0bfd21e4086b SHA-256: a478ce91816675371ceee80cd8c4c05410b9f24e396b9d740e5bb1d9c460eba2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of a link farm on disposable hosting suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://poaglasses.com/uploads/files/202109020023004529.pdf In PDF document text
    • https://badanie-wody.pl/galeria/file/mufaraduxovili.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/subozapukufovenoroso.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/paxowi.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210912_256FF8042B80C654.pdfIn PDF document text
    • https://e-room.co/userfiles/file/milik.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/40071487754.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/58399994187.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/xozopuluru.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/zuworixa.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/vadukoguzalaredajulo.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/39972163753.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/bugopiled.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-26/20210926074643140197.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/mitejatera.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/jebuz.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e1bf3d3f0---75317458853.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-20/images/files/zevakenanipepu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/naxoruzifolonadofozow.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/29206557800.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/78416110292.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a606887e56---67598025681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ptv+sports+download+for+pcPDF 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_off0000ad54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 16496 bytes
SHA-256: becdd41e1ade35f34a2fc48eec8c2a19157a04264512d9d7e95622b0e1e7e7c2
font_02_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 10544 bytes
SHA-256: 3f2671658167bebdf93e4c7ce36549918d25897b83b51b7c9d363ca4703b7581

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