Malicious PDF — malware analysis report

Static analysis result for SHA-256 199985382e67ba2a…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 10:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b4d779b2631d6960238f55a801746b2a SHA-1: dfb455e06a78fcdf4852b178c815833a1bcc12ff SHA-256: 199985382e67ba2a08a46220a6df8edf691ed6f7309e544d34651431dcc4b5f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs pointing to disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://allytemp.ru/uplcv?utm_term=shareit+versi+4 PDF link annotation
    • http://abw10thstreetne.com/uploads/files/62620966246.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/vowidapetiwa.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/xolukudurej.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109231706231044.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459f92c2956---36821293176.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/sanepezulujumijisoka.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/40123583600.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/tutagasedaroparatud.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/rosinuvutagetivurijete.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/5645809843.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/sokosadodaxojusajibero.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/56471942992.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/noxujofaxawotezoli.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/35640200862.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/bumelazuruvivisidatorir.pdfIn PDF document text
    • https://telorgabus.com/contents/files/genowuxuxuxixanagixe.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/66924199786.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/70001693366.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/2623702389.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/56076085805.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde32981d4---xuvebagudasomozizugijime.pdfIn PDF document text
    • 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_off0000afa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 10156 bytes
SHA-256: 69c6969dd2a1f63d06a514b397ab5ef24a9fd5ad4787482e4d07ff8d163b4739
font_02_sfnt_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 15212 bytes
SHA-256: 2f3d48841bc75d5353f34a1725ea6440eafe2c627df8506f5c64f10aa2a2df37

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