Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0d055fef0991a1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 15:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68b9135704d60d50ee5a9623a9d632a7 SHA-1: 93c770178a4152d28f93c10feee59fb66d8c7a72 SHA-256: eb0d055fef0991a1f6bbb1c94142ccdf8919ac1686cf92be4f99d517a29dea08
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9341

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://sangtaoad.com/uploads/userfiles/file/37403463221.pdf In PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/fogefivabipugu.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/88655292009.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/72566833524.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/22111933122.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613462637b3cf---sanaxezakapabibeg.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/59739417229.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/94376828923.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/96997260007.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/kebajujekanusoba.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/xagitebowa.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/73745342511.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/gabala.pdfIn PDF document text
    • https://kaparatt.com/images/File/33920975973.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/tejaxan.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/dexujekunijusurut.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2f2b34d1---zanekegudipowitetepa.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/7931111583.pdfIn PDF document text
    • http://poliinc.com/upload/files/31300861952.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/30024381472.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091307172573499.pdfIn PDF document text
    • http://synfarm.com/upload/files/tofufato.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/4820463287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cv+curriculum+vitae+meaningPDF link annotation
    • 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_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 19244 bytes
SHA-256: fdd0d0353e7b5c25d40ed0dd16f79936a7e8ca39f0789958113cf785695fa383
font_01_sfnt_off000117e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 10480 bytes
SHA-256: 789d32b5d4768ead165535d4dbe01c06c1b86c58f192eb05db0c67e161a560b3
font_02_sfnt_off00012fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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