Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2dc8878b2c6412…

MALICIOUS

PDF

72.4 KB Created: 2021-09-24 10:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 833d576dc41a1264d0745bd9a73cd3a1 SHA-1: 9f3f7dcdd4298a259dbb35140a05c0a0e6c481f8 SHA-256: fd2dc8878b2c64121ccaa3d9f43332c519465b43acb2b4ab63134b37e45053fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs that point to disposable hosting and function as a link farm, a common tactic for phishing or distributing further malware. The presence of these URLs and the link farm structure strongly suggests a malicious intent to redirect users to harmful sites.

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 https://smidgel.ru/uplcv?utm_term=gta+5+lite+mod+apk
    • https://alpinashop.bg/files/96683559518.pdf
    • http://stromzeleny.cz/file/medoxusekosubowifodi.pdf
    • http://brilspa.ro/userfiles/file///28665519885.pdf
    • http://hyundai-baoloc.com/luutru/files/lilalumivajutupiw.pdf
    • http://decamiones.com/userfiles/file/pakipezurugijejogidek.pdf
    • https://suthuytinh.com/app/webroot/uploads/files/tulotawuwe.pdf
    • https://renewone.de/files/luvarisikebagukobe.pdf
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/12499697713.pdf
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/13644071917.pdf
    • https://vaitinhdien.com/app/webroot/upload/files/taforusonovavegu.pdf
    • http://ajej.pretty-match.com/upload/files/22561945751.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16142a507546d9---50175506806.pdf
    • http://sjccgy.com/userfiles/file/misitotin.pdf
    • http://tsrmvolontari.it/userfiles/files/1537051635.pdf
    • http://faw-asia.com/image/upload/files/zejexenifagiwejakojolev.pdf
    • http://sb-78.ru/files/file/35752846496.pdf
    • http://satunatc.ac.th/ckfinder/userfiles/files/2969316718.pdf
    • http://spalovnachemolak.sk/userfiles/file/22017029237.pdf
    • http://3qbuy.com/CKEdit/upload/files/zofewurilafazinoxovuloz.pdf
    • http://frutapac.es/ckfinder/userfiles/files/sogafif.pdf
    • http://bioaec.com/userfiles/files/fixaguxupuwiwodipuma.pdf
    • https://adminico.nl/userfiles/file/pidubakol.pdf
    • http://revize-elektro.info/UserFiles/File/siwasulowaji.pdf
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/97169867546.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_off0000bb68.bin
7febbaabdc24cf2ff62ff21004942d9860941166b75f44809c18cbe362a7ed95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB68 15928 bytes
font_01_sfnt_off0000e428.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 16792 bytes
font_02_sfnt_off0000fc3f.bin
0d75d14ae0681496bf8f5136ebc5411b1488be992095651e18fdff87bf37ccc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 10448 bytes

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