Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb9b270c37b0292…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 06:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0386271aa59ffcda641484f84333868 SHA-1: 13dbd6e936fffde13b9a633a1c4dfa8d184d4fb2 SHA-256: 9eb9b270c37b02926326c63b563d10a80790989803ccae815e0d05e3b0ad491d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms or disposable hosting, indicating a strong intent to redirect users. The PDF's structure and the presence of external links suggest it is used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=android+rss+reader+source+code PDF link annotation
    • http://laser-piskovani.cz/democms/userfiles/file/24180714295.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/bukokozamubudeloxed.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/1290812763.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/zuzawosoxiveguvefuzat.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/80410880308.pdfIn PDF document text
    • http://llux.vn/uploads/files/jadekasojudunobewawovo.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/xuvunasanuvitiboji.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/90393218893.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210909091637.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/lanarufalorudupukako.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/dositigigedodebif.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/miduravukitilukisowaj.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/54829399646.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906061036.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/b438c1p02ut740tp0rv7r87gls/81780495260.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161318628beba9---73047582166.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/67519452875.pdfIn PDF document text
    • http://aven.su/userfiles/file/jixak.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/pasunaloxunures.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/38067686894.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/87271722363.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/fejonewegewepiruzamanux.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_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 17468 bytes
SHA-256: 1b41295c5a182710c1a515f8262305392f36186f5b38d2ff0e7c68450c182492
font_01_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13333 10300 bytes
SHA-256: ba61ec956b41e1ab3facfe858be812120852ff04e46860533033bc3cf4f76b3a

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