Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f2e83bedb3dac8…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 19:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4a3d9c544d2603515e5ebd9656610c33 SHA-1: 6749296f2f2b9352ba763c6b5fb7c8108f59c390 SHA-256: a7f2e83bedb3dac8d445cc62fb2d90559366d38eae046f642309e1986c036ee0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm. The presence of these URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=rich+and+grow+book+pdf PDF link annotation
    • http://sportingclubalbinia.eu/userfiles/files/42370222272.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/fimuvomexafitunefi.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/wimomilapa.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/rojivilowizonir.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-11/images/files/18550192143.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/54900341853.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1a83c65f94d1af6432e2ebeed98e48b5/65731704858.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/kadomaburekomaxalosebu.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/72941424069.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/dukurejogubowagulabaz.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/99113067945.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/tunobudepiwiga.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/66310250783.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/xagiwivelediv.pdfIn PDF document text
    • https://ekransamara.ru/files/xubosejepa.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/mokigigogebipivi.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/5803025472.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/ruvefa.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/selupeg.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/52264582745.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/vekevuxa.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/zofegokobis.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385ddc0f2d4---pabutikonilewona.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_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 18512 bytes
SHA-256: 4149fecad2761c4410323e25708e90986d95be621ae24984379fb1ac91ba9798
font_01_sfnt_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 10816 bytes
SHA-256: 72c1966baeb4c0fccc94603c7fe8b83e3fbb1fa5e4b409d79dbccc2421dea51b

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