Malicious PDF — malware analysis report

Static analysis result for SHA-256 9276b36b9d47baf0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 07:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ca46edb283afe5c78674fcaa7a61ec0 SHA-1: b0dd45db175d0aa3adc14fdb356dab193611d75d SHA-256: 9276b36b9d47baf00ecb9c0ae63ffcba4a6e79be36b009afd377ff4a6f2d9bbf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised or suspicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score indicate a malicious intent to redirect users. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://durgabas.coop.np/ckfinder/userfiles/files/mogebusobekapes.pdf In PDF document text
    • http://robvancampen.nl/userfiles/file/28077216263.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/towigovawunupusasasomuro.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/62542554702.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/54616030835.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/17275291657.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/96732656498.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/23067059736.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/gimof.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/perudujeduzu.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/3410466287.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/2352379944.pdfIn PDF document text
    • http://arablift.net/userfiles/file/rolij.pdfIn PDF document text
    • https://km2804.com/ckupload/files/1288405507.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/mojajusivosalop.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/ruximorilawizolozivu.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/39952637063.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/zuzinosilabojegabolutuzo.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/dejojixur.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/tedaxidodupexerofajom.pdfIn PDF document text
    • http://mp-journal.com/media/file/sizalujugimafebobegututof.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/xewijidi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6499025c---9229461999.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/98094158123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=watch+chinese+movies+online+with+english+subtitlesPDF 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_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 10960 bytes
SHA-256: 20f56a22ae6a232ab5f42213ff02bd3634efb6620720dc4d12c2add7417c8590
font_01_sfnt_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 17640 bytes
SHA-256: bdac140f4338c7b3b040c307ab298356db0f3d99ed611fc9220a8cd076503d41