Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fb2e36d7d90c57…

MALICIOUS

PDF

73.9 KB Created: 2021-09-20 14:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8f084763ef93561f1a23ce0a3b313fd SHA-1: 281a3f063f1526379bb1f5acd08d25bef6fb9d78 SHA-256: d5fb2e36d7d90c572d1fdced879ee680c3aaac532fbe92765402c28d0179c4cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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://philabc.ru/uplcv?utm_term=redmi+9+prime+auto+call+recorder PDF link annotation
    • https://mebelihome.ru/upload_picture/xalizosizesalarukel.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/lomuliduzajadupizirej.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/77247303815.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/towiwubibadabeleboxolilum.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/daxurexuxilan.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/38763509019.pdfIn PDF document text
    • http://dgkno.cn/upload/mumedukulumuwosasuzo.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/44226934724.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/67687002937.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/momup.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/kozatadumalajokizakabu.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/sudepizil.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/gerigegikedodibibokoxaga.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/zegubaziwovafapubokibev.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/wopusiruzu.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/70718609501.pdfIn PDF document text
    • https://kratky.eu/files/file/pisowasemada.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/71991417855.pdfIn PDF document text
    • http://abwessex.com/uploads/files/bamokegozanosaseluxisavok.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/jozefef.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac5f3395b4---60777326476.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/15698459767.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/73407890216.pdfIn PDF document text
    • http://effekt-film.de/files/file/90394876995.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_off0000bbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 10716 bytes
SHA-256: 2598edfba985c5c35a931bd6444ba2a79265319c074a21713949e3e31256a723
font_02_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 17788 bytes
SHA-256: 97c01599666c62985858407d8fb8bfaa4a61df95a42b09b89733e3c3697d1895

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