Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e009a7709ba5df…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 01:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8697bc3b428ff1e6b235a53320d8eaaf SHA-1: 90d326a1b9373ebc930935a018147f2f02df279b SHA-256: 85e009a7709ba5df8667b0cc032905e378ba8de8c609bed3618e428dbed6fec8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains, suggesting it is part of a link farm or phishing campaign. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://maquinandoysubastando.com/dleyes/admin/fotos/file/dorewufabixe.pdf In PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/5978562044.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210913_C228EBE5C669180D.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/94998604289.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5ea2b50b---35010151246.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/6134507874.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/rixewigikodagosuxemaleda.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/74964256811.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109141607068181.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d7162a23b---fuxowod.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/bubafewiruredulifebubudi.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/94133871999.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/solidajozome.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/15566144602.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/90799568964.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210920_142834.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109112156408075.pdfIn PDF document text
    • http://www.grifin.sk/files/zaruxiwabedejokiluv.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/12537673757.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/73560441300.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/18139527916.pdfIn PDF document text
    • http://partiaweb.com/upload/files/luduxiseraxunugudodibupol.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/72542166481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=online+document+viewerPDF 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_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 18072 bytes
SHA-256: 367317990cc5a0eced7460ac1e274a1e94c36284ed4c2d52e5e628e0c7af8f6c
font_02_sfnt_off00011f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 10480 bytes
SHA-256: e77a942032c996422b00ae5e268bf365cd4e159f47c2ace4f2a6157775a62099

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