Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe8b41385346747…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 21:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15aa262df9ac2a7142ef0312f8d534b2 SHA-1: c52f28fb957b73b1ad50d6a653bc1ca3fb707e18 SHA-256: 1fe8b41385346747cb56d02ef54579773fc3e6db93e26fda6d006323805390f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://afro-safari.com/upload/files/19554121287.pdf In PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/9594087047.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/10685482578.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/39750810058.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/zaboserojikewexigop.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/ridamigotimevorutuxuwes.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/buwix.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/68998562758.pdfIn PDF document text
    • https://yasacompany.com/upload/files/tetetoxitopulurax.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/vubuvidogufap.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/nijitidevotixituturum.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/97652316352.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/17858923964.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/73700483338.pdfIn PDF document text
    • http://balalajka.nu/media/56891036181.pdfIn PDF document text
    • https://pratham.one/file/25705073343.pdfIn PDF document text
    • https://harmony.im/userfiles/file/18984791431.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/dekeguzajerokem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee3a17da6---984743745.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/finudixolivekumib.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/af0e2ec823d7371da6beffb9959bf653/43341069755.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/69935302093.pdfIn PDF document text
    • http://synowka.pl/galeria/file/37248022882.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/86393037417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=visa+gta+sa+androidPDF 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_off0000ccb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB9 19140 bytes
SHA-256: 7627d2cb8fc8478313006b9a615a51e9687a405535f80601c2a329ca74dd54fc
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 10216 bytes
SHA-256: 6124446f317e7e3d1aa145899e3022a730085780e51717106c0326136589349f

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