Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb82d4f22b712c2…

MALICIOUS

PDF

83.3 KB Created: 2021-11-12 13:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 868fb9c93e804217c1ed1911ee5f279e SHA-1: 0239d1528b224e323135d9feaaab1b05c267fab8 SHA-256: 4cb82d4f22b712c289f6fc256856a963e0cf93a8f3a71865cdec466ce316e6d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://profitaler.com/UserFiles/file/medimoxexe.pdf In PDF document text
    • https://majubesar.com/contents/files/31536897210.pdfIn PDF document text
    • http://scoutpate.de/userfiles/file/48953109089.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/20100795926.pdfIn PDF document text
    • https://comfort8889.com/upload/files/32605941932.pdfIn PDF document text
    • http://getem.eu/files/file/gololobovikogifofobixen.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/fowowijovodega.pdfIn PDF document text
    • https://ghnservizi.com/file/49427161824.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/98493276910.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/kedovije.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/zepodo.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/9303733300.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/vumofodidimakor.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/69571629773.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/gegakezojegukodu.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/likoduge.pdfIn PDF document text
    • http://belovosushi.ru/files/47345254586.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/setopatumuzorigezexukoz.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/18832997360.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/25278098584.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/kiwatejorazo.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/pelovoxutase.pdfIn PDF document text
    • http://it-hair.com/userfiles/39009604461.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/57828822870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=boston+terrier+bully+mixPDF 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_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 10616 bytes
SHA-256: fdca94638d54a55eba09727434a376c42d491400f88a07120ecf4741af86c12a
font_01_sfnt_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 18196 bytes
SHA-256: aa4afd55bd5a5c4dceec6364f3bd963ba2e9014817e5a1e3c7c27016326a4d49

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