Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fe899396ef4746…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 05:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73f74d14c7a5cdfea5889df3d2d6b03b SHA-1: 6698ccd99334b40dd23c421e144b324e839a7a37 SHA-256: 87fe899396ef4746a5f10de52f2b62050d62f7068a6acdd5e2acf58d61208d76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malicious content. The presence of external URIs and the link farm heuristic strongly suggest an intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crysiq.ru/uplcv?utm_term=bochs+android+windows+7 PDF link annotation
    • http://bargiel.com.pl/ckfinder/userfiles/files/javeruw.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/66701572869.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/podakigimat.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/68292004639.pdfIn PDF document text
    • https://anesaportugal.org/upload/file/kixifu.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/62947799974.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/65663812685.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/64375164807.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0c47e3b8---zubogokapibukanigalazuru.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/32954847092.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/73696588229.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nugikejaziwebox.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/39087763130.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/66039794337.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/debufadapu.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/11213881970.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/gefiririxotavuweduto.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/jewomexudipadaxipipakone.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd246379f---11643387913.pdfIn PDF document text
    • https://maturana.cl/upload/file/65157718778.pdfIn PDF document text
    • http://thedreams.cz/files/werejilezetawo.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_off0000b23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 10380 bytes
SHA-256: eef93d391ec93b71fdf28afc633d42199e81e4c5bcd9eaad7c917cfffecc8970
font_02_sfnt_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 17328 bytes
SHA-256: 27736283e4dbda6e01ccb2a124173eb29ea7c547d8f76f63ac604f364b5b5364

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