Malicious PDF — malware analysis report

Static analysis result for SHA-256 914d07ca083152f9…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 06:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a2835d73593f5de19351b391be779c3 SHA-1: a251eea760a4f3744299e9548f958150c40a5e50 SHA-256: 914d07ca083152f9e5478bb8d678b05575ef4ec5e9ab62a6b6a0b5be5039ae5e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to sites hosting malware or phishing content. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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
  • 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://krisoc.ru/uplcv?utm_term=sat+math+level+2+practice+test+pdf
    • http://senvietsystem.com/ckeditor/upload/files/pasabaxi.pdf
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/velaredufotisev.pdf
    • http://yushendesign.com/images_fck/file/1631033270.pdf
    • https://hongmao.tw/uploads/files/202109192115024428.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161524d894d742---xanikanut.pdf
    • https://divinenine.net/userfiles/file/mapoxuvanekeboruloz.pdf
    • https://interstudy.net/userfiles/file/makedukasuf.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161327e5587c8c---53800198617.pdf
    • http://kolesa.sk/files/xijekapiwerageripisaj.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/bowefivirix.pdf
    • http://yejida.com/userfiles/file/xabogutunalexasatus.pdf
    • http://home-plast.ru/foto/files/6234494248.pdf
    • http://venkateshservices.com/uploads/66830834362.pdf
    • http://toyotarent.hk/FileData/ckfinder/files/20210909_C02E483F35368346.pdf
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/vofevajuluvi.pdf
    • http://kapfenberger-schuetzenverein.at/userfiles/file/41425390860.pdf
    • http://sunway.me/ROOT_PATHuploads/file/061820041041.pdf
    • http://madonnina.info/userfiles/files/19480443586.pdf
    • https://cs168.tw/upfiles/editor/files/40354445078.pdf
    • https://bonaparte.cappencms.com/templates/files/govapasosiputel.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210905_161552.pdf
    • http://bellamy.tw/uploads/files/202109230249561892.pdf
    • https://savitravel.ro/ckfinder/userfiles/files/gefebelez.pdf
    • http://bubb.cn/up_file/file/45763225910.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/43676217034.pdf
    • 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_off0000b1fb.bin
1b804542278645aeed3480f870905d8e7bcbed00dfc887bc781ecc05cb0dc6e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FB 10924 bytes
font_01_sfnt_off0000cb4a.bin
39fcfc1884841990277c661060eaad9f86acc444ae279415d6c7c60dc098bd05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 17320 bytes
font_02_sfnt_off0000f798.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 16792 bytes

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