Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a8c1f6478d7322…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 12:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 519d64c34b2a112dab74dec36c6f38da SHA-1: cbe79cba49c965e943426f57f35e541f8b6b5351 SHA-256: 77a8c1f6478d732248670a53eeeb823af6b4da6a54ff33c4d76ee5fb606ea2c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, consistent with a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wemservice.com/ckfinder/userfiles/files/waxakutulovakavikonefuze.pdf In PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/7314965470.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/72684895544.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-10/20210910080814165197.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/43618493189.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/sunumezabezujuvevuretug.pdfIn PDF document text
    • http://zae.me/datafiles/file/javibalegetaxugunodepibag.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/81180828335.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/56725869525.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/gawefozuzuwib.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/negovizufivosiw.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/gimuxijefagasorisor.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161392f805bb97---56385677042.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/sufed.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/45010963889.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/60962373237.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/kuxusijanatusul.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e80e331d---53820471084.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/48479973411.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/naxenumideruvujinid.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109110124337532.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/26447997764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+backup+rootPDF 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_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 17356 bytes
SHA-256: 049498a3d9e4addc77b116230f5d71447c9e1457e2def4590f690c97adcef143
font_01_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 10472 bytes
SHA-256: 2255364c64ee0803caccec746c68e68949d6f9d52e3ed4e68c7dde238730f7f6
font_02_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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