Malicious PDF — malware analysis report

Static analysis result for SHA-256 79462ab05c7a256c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 22:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a586a58e219d88350be28f350d8c9dbf SHA-1: 3651d2ad149c6a61006fc49947671925d7663e4b SHA-256: 79462ab05c7a256c327b605b44f51b74882b110435daaca7e4e2a4ff7d12fc69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it is designed to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://smidgel.ru/uplcv?utm_term=lan+wifi+games PDF link annotation
    • http://epoptavky.com/is/images/FCKeditor/File/kodikajilemifujevus.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/20007549386.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/sukubosaziwedo.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/82437038295.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac228c7ad0---50343530695.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a87ca0bec---xisiruvasigagekemozu.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/jupidivovixazabegiwomevaw.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/pevaseduxed.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/20863890635.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/dofegajuzuputexidub.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/9729544821.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/119052611.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/bomepiduxeji.pdfIn PDF document text
    • https://euchebnici.com/img/file/nitivoxopofan.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/46961098528.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/8052944371.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/palowogejikiwafal.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c493debba7---38304922295.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/87166722683.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/86983130837.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210919_201332.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/pamapuxodatofabuvoko.pdfIn PDF document text
    • http://innotack.com/userfiles/files/negivasatedijo.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/36165295747.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/52147023096.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/35343475135.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_off0000b715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 10236 bytes
SHA-256: ae2aaf263e849644fcdd354cd51437066d8fdcb27c2bf216a3e9320deca17604
font_02_sfnt_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 15444 bytes
SHA-256: 84fac22caceb63be4371660a93c10c7ff4b184054978a7b6bf4e772d4e28d9bf