Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55feddec8397a30…

MALICIOUS

PDF

77.4 KB Created: 2021-09-12 08:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dadbf98003b3bac0824c149a726a3d6a SHA-1: f3ed9d997c773adcc3b0afa52fe667c16448d6d4 SHA-256: a55feddec8397a300cef945f81117d3965557044e687d4d1e9cc49ec4d388c53
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 numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://goraku-sangyo.com/userfiles/file/polodawomivetoduzesumadun.pdf In PDF document text
    • https://hiperaktivite.info/userfiles/files/86695335296.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/gajel.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320c3146dd9---gegev.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/fofofunukipumevejopisu.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/gezedarijezikuzaw.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/49743801735.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/67739039510.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/89996584643.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/38049894500.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387b51dbf14---82689887788.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/27510348686.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/53245759437.pdfIn PDF document text
    • https://htchninc.com/d/files/tepusesegidotepibetulimaw.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/nukirigolepijenuvigo.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/tiromoxagoxalusemugalefeb.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/vurij.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/lilirurofivimu.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/xidevunoxurunasef.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/tapezol.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109041532398256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+periodically+send+location+to+serverPDF 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_off0000c95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 10668 bytes
SHA-256: cd46fdcd4fb23aa8c626b5aa016c6df0ab794a808b241491528c22b3dbd0589b
font_01_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 17452 bytes
SHA-256: eb81face6eadcdb964d5280f537478130859e4571c7f62ee849a7a95b4fd20c0
font_02_sfnt_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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