Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ce9fc92fce6e65…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 11:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 980541130643b77c4feda552fa12fb38 SHA-1: bef49ca15b309225c53f19389cb793c9ad18805d SHA-256: c2ce9fc92fce6e6565fff29e178ea1d73488d42a5882710ed12c85d165981613
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The PDF's structure and the presence of external URIs indicate an attempt to redirect the user to malicious content.

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://krisoc.ru/uplcv?utm_term=wear+os+vs+watch+os PDF link annotation
    • http://www.cafeinca.com/img/public/contenido/file/61527998272.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/kitofapaxagemizona.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/25857147576.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/fidoliwijirisevitarujus.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/bepifobikuzapisep.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/jodobibujetimiwu.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/ziwexuvakilegabafel.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/69460064428.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/10408803853.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/dufamisazebebopijadojalib.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/vopelidewubesuza.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/90909761951.pdfIn PDF document text
    • https://raljob.com/userfiles/file/45871525105.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/bonodozibibe.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b71ab2dca9---rizisobo.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/bodabizilazupag.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613576fc46980---20873028156.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/82670649687.pdfIn PDF document text
    • http://aa-nusd.jp/10753925132.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/nosetesavivinanolip.pdfIn PDF document text
    • https://kar360.com/resimler/files/xododifiju.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/zizuxa.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/bubabadaruxaguropen.pdfIn PDF document text
    • http://chipgene.com/image/files/20210910_181734.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_off0000b073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 16616 bytes
SHA-256: 7d0cdcd5507207b0fa828f8a4b43a8379b230e045d8824a14533552cf874047a
font_01_sfnt_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 10228 bytes
SHA-256: a9a8a74f1664c7c30963604674d774fe06bc7d54d8858f5cb5e64a16a5da888a