Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceff33c2d298a4dd…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 08:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 713439b5fd6ab38e00bb268f7d085ce5 SHA-1: 64ab43c95752a6bce09e9772685d94368db88869 SHA-256: ceff33c2d298a4dd23a7b17d5d9e4e0cf451ffedb8559233ee8be3178fa8970c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, suggests a link farm designed to redirect users. The 'Urgency Lure' heuristic further supports the phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=aha+random+video+chat PDF link annotation
    • http://www.jokilaaksonratsastajat.fi/file/96948941295.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/gotibatiduvavirap.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/46009494528.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/11932869774.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/31161121805.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/peniboxogosifabafabapu.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/ginimomamiderot.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/3576471286130f5bb42f13.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/vapemilejuvagosin.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/3563679503.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/19295818814.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/38312611558.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/vuroxab.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/28710163188.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/85019368055.pdfIn PDF document text
    • https://777mto.org/contents/files/netor.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed24874d41---83414268844.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/92224901116.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/virugufapigaratuz.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/54538977645.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xudekodipe.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/60280574324.pdfIn PDF document text
    • http://ppp220.com/Upload/file/lobal.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_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 10468 bytes
SHA-256: f94038cbb9893d1dbe2535c1c6063f138139beca348123f0084c51846c605dfe
font_01_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 18164 bytes
SHA-256: 94135ba9027536ddc9eb68e074842f23e0b83c7fe43f76175e4575c122f195fb

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