Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1dd84a6bd6f24f2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 06:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6bc169609b96911e330b2ed4d32ece12 SHA-1: b2903f7059bd7aefadc4d48392dd600938cf0e28 SHA-256: b1dd84a6bd6f24f2a722b89757f3a36073863ad563399ec40fb3b25b5bec0946
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which are designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, and the presence of an IP address literal in a URL further suggests malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=gta+v+android+android PDF link annotation
    • https://adeptos.clevercloud.pt/images/items/files/sagavab.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/63268541310.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/zazobujago.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/61375150479.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/fopejunomenasojuwados.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/pinuvozikiterozivipupuz.pdfPDF link annotation
    • https://vildmarksjagt.dk/userfiles/file/10613319432.pdfIn PDF document text
    • https://diphong.com/uploads/dugapa.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142afd481e7a---68173072134.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/66520537274.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/furogusurunanoxew.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613402a131e6f---rasamisikamirud.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/jukok.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/86097482853.pdfIn PDF document text
    • http://agmapure.com/upload/files/godiredazofopemilolizod.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/83060715375.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/16141941511.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/zexeke.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/17590980204.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/5020015083.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/67522106007.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/69236668822.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/tetezajadiketenugamafaz.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/19409012555.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/felapoduriwegegi.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_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 10000 bytes
SHA-256: 0589ce12f4f3a0fefcd076abd72b5edc43677b3d3b24c95f07911c5063c4218e
font_02_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 17600 bytes
SHA-256: 94cd15ad78c9e95b684507942704dd2dddd762e26434c8c557a1d27dccb66c51