Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdb87ab9e5bd208…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 02:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab9d81e01ed126a6604dae9094595e34 SHA-1: 8057bbbd1107dc49e3d49a99c7c7c715e0f5d124 SHA-256: ffdb87ab9e5bd208478bfce48930967c88059c9c2eb09f473404e8425d93e51b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://automotiveenergy.cz/userfiles/file/25325054196.pdf In PDF document text
    • http://inwallendorf.de/userfiles/file/weronebipadoxavil.pdfIn PDF document text
    • http://abc-tel.ru/data/File/xamuzewibituxoloz.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/dijowej.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/kufidibajukiruto.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/56461157433.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/1999125124.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/50157355967.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/58940027056.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/15640085827.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/tedirosezatujugusogap.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/lasorefomududaverapizota.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/vegadujijisalol.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/wuwegur.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/talokisuv.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/59948984402.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/33832200660.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210913_081629_190.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/nobowafono.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/sukabufopixizapagi.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/90092703486.pdfIn PDF document text
    • https://laser123.com/geektic/files/gupijufudegefin.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/rutuv.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/lolamusawekuvenomod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=swamp+attack+hack+apk+downloadPDF 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_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 18428 bytes
SHA-256: 8c83b74656ab4e66a7dd092b6259199dadd692cae93b2c0cea837226c449bf8d
font_01_sfnt_off00010f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 10540 bytes
SHA-256: 5263edc55b93d5da0b5ea65d511e92602fd7b4e0156b9623a91ff9bc56634372
font_02_sfnt_off00012757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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