Malicious PDF — malware analysis report

Static analysis result for SHA-256 2582ddaec3e793e4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 05:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e19200ae4865943d7b41a313ca3b823f SHA-1: 5e0ed6a0c2d1c0e3cedc3cb9f51622034b36bafd SHA-256: 2582ddaec3e793e4846898970bf84b2517fa18bb2adc63d8c7acafc16690e94f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this purpose. No scripts were extracted, but the presence of numerous external URIs is the primary indicator of malicious intent.

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://cructi.ru/uplcv?utm_term=can+i+know+who+watched+my+instagram+video PDF link annotation
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/58225642536.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/nojekuvugid.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/76402716030.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/46135732748.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/feguwurudolaseve.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/96802245397.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337b3cc7836---mulizi.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a582b10db---madirorotubodixu.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/bafukep.pdfIn PDF document text
    • https://thepainter.asia/upload/files/lafagipepelaxan.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/63442726037.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/20988756887.pdfIn PDF document text
    • https://webrobogo.hu/kepek/lefelaputetazip.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/zubepabeg.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/gezogulome.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/zosevimojesixase.pdfIn PDF document text
    • http://gibisch.com/files/files/68617198673.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/75736843376.pdfIn PDF document text
    • https://kapefashion.com/files/files/69040197917.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/41253145412.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/ketavopawuw.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/74100778681.pdfIn PDF document text
    • http://shamayachts.com/upload/file/33025713474.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/tofidasafer.pdfIn PDF document text
    • https://luminex.pl/upload/file/negefe.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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 17640 bytes
SHA-256: 8383092626a76b2a8a337a9cff4be99562cba513f786bad1a2431ad07b4e2b4c
font_01_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12064 11160 bytes
SHA-256: 3edc7acfa42639e37462ff8e72c59939f5c946767771ca8964b7dc86e4903507

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