Malicious PDF — malware analysis report

Static analysis result for SHA-256 007457c8e375fe21…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 00:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef82e3c4eff515d14b0d02ebfaad12ee SHA-1: 22939d6adade05e97b351b33311d2c76bc8abe44 SHA-256: 007457c8e375fe214d76525dd769d97a3fa514736ab1b544df0634d7fb031e70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

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://queure.ru/uplcv?utm_term=android+restore+backup+from+another+phone PDF link annotation
    • http://happysmilecard.com/uploads/files/sebukikag.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/tuxigo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/davixadiruj.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/41961042896.pdfIn PDF document text
    • http://tcihk.com/userfiles/lukejolexonevonimoxiru.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/78170168604.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344d519402c---19156863631.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/17264833901.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/29774620910.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/ledetesodurotifim.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/61217562077.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/80487547973.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/89955035874.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/zusizipul.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/vubugenaludasitizelugezo.pdfIn PDF document text
    • http://fructusartis.com/i/File/vafiro.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/susaruvuzizi.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/dezosuzisifazum.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/17703502617.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/devubawupubatunosizuves.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/wenivutitoxiwixa.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/vizada.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sibidadazututeposepali.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16142dfba5ab52---ralas.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_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 11152 bytes
SHA-256: a84dd7d7f8e206da414cb0ffe9cdbd448ddc84a7974b5ab1102649395d8a1321
font_01_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 17620 bytes
SHA-256: e9f82abd8b81f096edc9a26ab7c1009c3672c7add268c23ff4c72315ff3b164a
font_02_sfnt_off00012f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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