Malicious PDF — malware analysis report

Static analysis result for SHA-256 0674ec4ec93de095…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 08:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c96e1c140991d6ebaab6c4ca2cbce6f5 SHA-1: d4715c376453647d2ed0909d00556935fdcf8206 SHA-256: 0674ec4ec93de09537e813397d188715b2a8b7ef586e50b5fcc293052892f282
134 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. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=excel+dashboard+training+pdf PDF link annotation
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/29051403175.pdfIn PDF document text
    • https://architektor.ru/uploads/file/57525907157.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/98992773392.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/nadiluvotuzukumigesef.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/94414823339.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/71172019016.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/53899991366.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/liduvoxovomokuzozawup.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/rasakel.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/48447657647.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/xijofowidasonuxifeduvi.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/13439183074.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/wozudugobinuwumupat.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dbcadef64---71735885291.pdfIn PDF document text
    • http://abwva.com/uploads/files/14875877777.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/17737676174.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/walejijibogenekevafebori.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/25722855621.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/papuburujok.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/bulusagekagosiwujaka.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1a2e08003845c400a8653b76ae9d5eb7/59519673340.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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 17668 bytes
SHA-256: d8fb171ca84245d35bcbd1006801efa77847d2d63f30e15f6877905b28331264
font_01_sfnt_off00011062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 11124 bytes
SHA-256: cb16dd5d4d5f8a3df71c866f4d2a8bcc742969825750adb6e13ca5fce4e30344

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