Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7761c8382ac838…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 13:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f783be7efbd289266f71b608adcd9d51 SHA-1: 0cf5c7d6a16180073393e1c70f74037931c77cac SHA-256: be7761c8382ac838edae25501283cd37483e60db6645546628b17b24b0c23350
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, with a significant portion pointing to potentially disposable hosting, characteristic of a link farm used to obscure malicious destinations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://quetthe.com/upload/files/nasipij.pdf In PDF document text
    • http://ellenia3.eu/userfiles/files/67867283599.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/34306023533.pdfIn PDF document text
    • http://bienbao.net/uploads/files/38646041668.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/45721128230.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/bamipolafodon.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/2172256662.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3bfe4f99cf8d4a7912ec5be2cbfb7aee/54348288803.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/67905304592.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/34258484532.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/xodawopo.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/lutudunasikozilurupupux.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/zaxozobulejokutu.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/jogujo.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/65094546259.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/54170169179.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/noxuzisamise.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/94140553535.pdfIn PDF document text
    • https://digireg.dk/upload/97936152210.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/56205895080.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/gotopanudepofew.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/wupinefaxofewalawuzuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=elementary+number+theory+and+its+applications+rosen+5th+edition+pdfPDF 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_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 17064 bytes
SHA-256: ce2eb7f630821a9ea0beee68bdc6df03d70cbca15eb88f9e5ff680d1ab7dfe4a
font_02_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 11356 bytes
SHA-256: 6cbee17ab2733f43e772bc97e70138c2969ea72a16d43e2f202f741007b18aca

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