Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cecd0bc5788e44a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 17:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4987deccdb57b4499a1ae8f4e064e2a SHA-1: b93f5095ade4c1da15afa7bbf536bd72d6f53e74 SHA-256: 2cecd0bc5788e44af7ee675b378f5ec616db45d56ad908250e4071e844327d1e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the high number of distinct hosts suggest this is part of a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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://khyljg.com/uploadfiles/files/37028105817.pdf In PDF document text
    • https://maurinet.com/userfiles/file/xevos.pdfIn PDF document text
    • http://jiducn.com/userfiles/aa/file///zezivuzorokumivur.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/movuvawijeso.pdfIn PDF document text
    • http://normel.org/files/upload/file/zefab.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/83881523994.pdfIn PDF document text
    • https://zagi.hr/files/dobopewed.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/mupalajakezosijoxivojoxe.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/gerazojobemerijogu.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/sikuvejusiresufoba.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/14134377540.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/sagijitudevebazorowufu.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/binugefinolefavi.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/88118157577.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/73309375490.pdfIn PDF document text
    • http://4yoga.by/pics/files/94996603917.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb03ae9ab---xatixuzepetefupobig.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ml0p7b883ttf9modqqq3s0nq1m/nitujekibufesoritogof.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/kisanabujiziguboj.pdfIn PDF document text
    • https://senegal4d.com/contents/files/5445925530.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/01/file/jaburovaxikowekotuxiluf.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/zumubad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=codes+for+free+v+bucksPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 18900 bytes
SHA-256: bebc39e4151aac526b460845fb705230c1a8528070714126862b6850f5a9b07d
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 10396 bytes
SHA-256: 73318fe3a5f469be0be62a0bf236681da98f9659b9940b52ff89b095f1f9b3f3

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