Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8efb142ac30cbe…

MALICIOUS

PDF

91.4 KB Created: 2021-09-13 03:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd456c9d57749c0562b81214110aaa50 SHA-1: a9dc753b5e5d9f4fb41a1a43deae7f1bb41bcec2 SHA-256: 3d8efb142ac30cbe76b1256a88db8a1767c572a90225e3e1af5137309d2aa90e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users to various external sites. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution campaign.

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://kuhomania.ru/ckfinder/userfiles/files/putakukodixitexo.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d69a5b043c---4185936920.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902130814610.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210913051624.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/kuwenux.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/jigus.pdfIn PDF document text
    • http://salvamontbihor.ro/app/webroot/files/userfiles/files/kaviwepufigo.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/viberosavejoxeru.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/91359991480.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/45946995965.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/vijutakeroziji.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/88375766989.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/68920903408.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/34ad0d0a57bb7062884187e34bceb05f/bajuzakenojenexud.pdfIn PDF document text
    • http://gnox.vn/upload/files/55060557065.pdfIn PDF document text
    • https://granitnet.hu/editor_up/kudatujutaxesudik.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/kejarugin.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/61577111658.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/3570344036.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/66421914195.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/xetenewikuji.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/zobijolijegufeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+action+movies+downloadPDF 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_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 17228 bytes
SHA-256: 786b8d016335ed168088ca520f62e3ef4e30bf833c0ed083e31fee30254a53bf
font_01_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 10636 bytes
SHA-256: 13945234dd48f23ebf661d8a9b3278276f4dfc94b177368121db209a5b70e0df
font_02_sfnt_off00014805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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