Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb622180d975e15…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 15:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37b2b7705d81a6ea75784cff5437cd16 SHA-1: bc3d2a8572358dd57b8aea6638e8f8ad93f483ba SHA-256: 3eb622180d975e15fc3991687ab118d1fe4fd4127a7b77636e5f3f994baed033
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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 http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/25881957566.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/94164595224.pdf
    • https://htchninc.com/d/files/wibopakorep.pdf
    • http://bulmarconsult.com/files/leduxixitawabewif.pdf
    • https://ev-owners.jp/userfiles/files/4167517205.pdf
    • https://arte-salon.ru/upload_picture/92743647200.pdf
    • http://cjatkinson.com/userimages/mafuxufejepox.pdf
    • https://ibericadearmerias.com/file/pesizimivulavome.pdf
    • http://lsneotek.com/ckupload/files/50867675953.pdf
    • http://vividconcept.in/userfiles/file/30578494228.pdf
    • http://getdol.com/page_data/file/57944103046.pdf
    • https://accounting789.com/ThImg/file/fugapajatituwupilowu.pdf
    • https://infotechsystemsonline.com/ital/www/img/file/55936124561.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/gogofovuxoxakabimon.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/36395607402.pdf
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210909_120917.pdf
    • http://botosani.ro/img/uploads/file/kukajuravufawogutawofav.pdf
    • http://razaviota.ir/basefile/razaviotair/files/117467940.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/xefaperopilumamasudatige.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161399482accc7---3152597096.pdf
    • http://bangladeshceramicsociety.com/uploads/editor/files/bipewuxiwijagivanafiriwen.pdf
    • http://argyleliquidations.com/userfiles/files/93534753168.pdf
    • http://baiduvpn.com/upload/files/tujonibulimo.pdf
    • https://dotcomtravelegypt.com/userfiles/files/78078519069.pdf
    • http://pekingtogo.com/uploads/files/pupelewogajofadimuruxena.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+emoji+blitz+keyboard+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000c972.bin
8533386f69c7eb4886d2020744c05e0c4ff0a8e241821ffb5c553fe50c2eb1a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 11036 bytes
font_01_sfnt_off0000e2e4.bin
582fbfe105b666a56fed5dd122d8cc7c9c1a6aaac312c4348670549fdf068757		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 17636 bytes
font_02_sfnt_off00011048.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 16792 bytes

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