Malicious PDF — malware analysis report

Static analysis result for SHA-256 056821ae51abd855…

MALICIOUS

PDF

89.7 KB Created: 2021-09-12 04:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b03fa18fc06aec2a793e741fccb9ee6 SHA-1: 3860c36d8851e817fdd3d11dab8151b74047efbd SHA-256: 056821ae51abd85549fd5f9829907072cf6d142782b101cebf5ef0ec357e5a47
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://buyyoutubelikes.com/ci/userfiles/files/77434005742.pdf In PDF document text
    • http://seamacros.com/upload/file/nilogufasake.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb59ce15d7---74765200644.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/tamupuzatazaxotepinatori.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210909_034727.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/jovilasupuruzidowo.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/sizolinefa.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/nudapitanipevovupowomud.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/60746758837.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613011deedc37---luruserenukipexureko.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wuzako.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/88678727200.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/41082643430.pdfIn PDF document text
    • http://midel.me/userfiles/file/xekowegixufalobuvazemaduf.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/jomimilatepepugo.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/51988747765.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/13819601900.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/jojufiwerep.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/39310044892.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/94620376846.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/56381139041.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/98807352230.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/96313080653.pdfIn PDF document text
    • https://turbooto.vn/upload/files/zapopiminubi.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/zejajatekilalogadorumow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=walter+payton+man+of+the+year+awardPDF 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_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 10696 bytes
SHA-256: 37632b8272451e669b0ba039caa283bde7ea922c2218de2046cea6217e1b193f
font_02_sfnt_off00012849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 18988 bytes
SHA-256: b8aa488a58bedd26813df207b89d55e603978d72537cc72401a582cd5d503c06