Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddfef90c8fc1e80…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 16:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f61c3c9db4500ee8f7d54ce2c79156b4 SHA-1: 56ed067642e9a7567b157c27a2e794036429652c SHA-256: 7ddfef90c8fc1e80a5ae09d5412e71e7ddc30f477981e5246483f8c8fa28308e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7229

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=ibis+paint+x+apk+android
    • http://navigator-nsk.ru/userfiles/file/budewin.pdf
    • http://akvatoria.by/UserFiles/files/30687091270.pdf
    • http://bezpiecznamlodosc.org/files/file/69434181448.pdf
    • http://erfaspot.com/resimler/files/91184777933.pdf
    • http://yas-center.ru/userfiles/file/9332873490.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210917_196252B48E1F8278.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/43942494515.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f49d1497d9---8114186748.pdf
    • https://rent-1.es/ckfinder/userfiles/files/45008466714.pdf
    • https://cremyco.com/app/webroot/docs/file/dusegele.pdf
    • https://www.delaneyllc.com/ckfinder/userfiles/files/dotolarekegevemeba.pdf
    • http://dr-onesrl.com/userfiles/files/reruzo.pdf
    • http://lahma.pl/_u/userfiles/file/71526865148.pdf
    • https://confeccionesruiz.cl/UserFiles/File/bobeneditozegifapirot.pdf
    • https://bellcera.60km.com/upload/files/varosatomojiwatef.pdf
    • https://medtek.vn/storage/file/tined.pdf
    • http://massvt.sk/editor_uploads/system/files/20729203752.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/51429643174.pdf
    • https://vargyasnekonyveles.hu/kepek/other/file/kakut.pdf
    • https://wangwangcamp.com/uploads/files/202109240610256743.pdf
    • http://vigova.com/Images_upload/files/27358447415.pdf
    • https://rtquery.reitoken.org/Coaching123/images/files/modevotuxamagojap.pdf
    • http://tetobox-budapest.hu/uploads/files/saladorojutaludoselonuse.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b46e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB46E 16792 bytes
font_01_sfnt_off0000cc80.bin
99305d2b57d4e59f8f583cede28b3739b0d418f3006ecc7e0ec5d1da2d62c20c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC80 17676 bytes
font_02_sfnt_off0000f9b7.bin
0529edc1b4b8ea3f6aa473799d94a43800bdcd694e581ee8b8c87a90240bd24a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 10492 bytes

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