Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a90e8184d704ee…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 16:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e96075f488789ebe3c3cddd77f0a324 SHA-1: cdf5567213c132f4ac401fbf57dd3eeecdee532b SHA-256: 27a90e8184d704ee06bf2a068ee4bc03deca90fa7cba58bb4e2df0c19ab423c2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious content or download a secondary payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a phishing or spamming operation, and the ClamAV detection confirms its malicious nature. The embedded JavaScript is likely responsible for initiating the malicious chain of events.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3499

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.
  • 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
  • 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://philabc.ru/uplcv?utm_term=el+sistema+material+requirement+planning+mrp+pdf PDF link annotation
    • http://banquat.com/userfiles/files/28238621186.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/73195183238.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/40988264216.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/56946093001.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/sajaxir.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/dudulazituzanidalugazu.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/laxizezewav.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161334f2a0188f---98600975091.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/66648376817.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/betuwuxejolologozeluf.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xuxonimufozumideriporik.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/13193590917.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/nujorid.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/29599157965.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/26084928381.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/juvarukejepikax.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/61047946508.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/subopeforewuguripiliwaz.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/57528595433.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/30981593194.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/felupugotumivij.pdfIn PDF document text
    • http://hocomesun.com/upload/36036642287.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/53782829573.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/71493870832.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001149e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 10952 bytes
SHA-256: 2599dd52633ac742ff1f2f7e765e0c61ca0e9bf2d1b1ecc90365cc89127d95ae

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