Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb667ad8a74c69c…

MALICIOUS

PDF

73.7 KB Created: 2021-09-22 23:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f0bec06115f7a63f29962ee6caf33b1 SHA-1: 423057318c60846c3c17636370e8b74a2d6f4c0d SHA-256: deb667ad8a74c69cd1b073b1219dc96b9879d94af03fc2aa85ff7b3040442648
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains or link farms, suggests a phishing or malware distribution campaign. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically highlights the nature of these links, aiming to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=how+to+mirror+your+android+phone+to+tv PDF link annotation
    • http://dptour.net/bot/ckfinder/uf/files/dejekewuvufotofuwonuj.pdfIn PDF document text
    • http://keitbg.com/images/files/nagerasezilebejisopar.pdfIn PDF document text
    • https://music-group-store.com/upload/files/56947322679.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/88855349251.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/55996149221.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/pejojebefo.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/22495166599.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/kamumimatogemoxir.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/81704404460.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/50897446887.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/zipunezeramesofakokami.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/98347768718.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/bubabed.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361050324be---97303205366.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/vujevefinugusave.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/53512096280.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/zuremume.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/26660661003.pdfIn PDF document text
    • https://dafelia.com/files/dixaweretuvegoxapeliv.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/silitilosozirizegisepo.pdfIn PDF document text
    • http://e-sheremet.com/img/16014963170.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/milegufozavu.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_off0000becb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECB 10800 bytes
SHA-256: 3cac16c8c51e9e1ba6f15901f545c177c7eaeb18bb796b7bda9e068ed29265ba
font_01_sfnt_off0000d777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD777 16252 bytes
SHA-256: 5b8c06ef0e7b4d2bbbdbe48ddb1a03c3d6b71534fa025c9e8d95a0f2fb23813d
font_02_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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