Malicious PDF — malware analysis report

Static analysis result for SHA-256 4baf897fe7b90a08…

MALICIOUS

PDF

74.1 KB Created: 2021-09-18 01:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42851c08fa7fb171e7ca1889746d49f2 SHA-1: 8c1592a196f6c48857caada3c7f020c178beede2 SHA-256: 4baf897fe7b90a08a866defacbdd1d93c18084bf01bf4a7ba9ae1f8ff95934cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior. While no scripts were extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=100+meter+sprint+game+unblocked PDF link annotation
    • https://all-stage-meditation.tw/uploads/files/613afb406a1e8.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/40877748740.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/1021298594.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/lobupide.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/72807271589.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210910_11555424D8D601A8.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/52815009740.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/42837746289.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614250254aad8---1235587368.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/zexuxodifuvineg.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/15802406361.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/taxarorodokimivezen.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/63536620129.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/92838132766.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/kujawixukozopofudo.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/52167490669.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/zavafupukisegavak.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/domigafaf.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/36791128804.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/dajud.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/linujadagijodute.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/reziwukuwefezekanufe.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-13/20210913063339988896.pdfIn PDF document text
    • https://turbooto.vn/upload/files/mekiza.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_off0000bc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC95 11264 bytes
SHA-256: c09c04df94b0b30447e11c04811978f5c2f2be3a78268b65cf99bb0f3de70f4a
font_01_sfnt_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 17112 bytes
SHA-256: 00be92c765a0c9774cadd3d227c3b0def15d3bfc720977b38d58c4d0dae2158f
font_02_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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