Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab93ded10e664172…

MALICIOUS

PDF

75.7 KB Created: 2021-09-22 22:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dcbca8c426495e1720c385938fa4fbd4 SHA-1: 8b89969fee48e91f0691d2e77d4e49766c65b640 SHA-256: ab93ded10e6641720cdc124a688d8f1f3ed977a3e75b027b7d4e8bb0728497bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external links, which are characteristic of phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nesemlak.com/test/images/uploads/files/gewodulapozobogoxum.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99a36be1b---5969176980.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/xipiwasigaz.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/55741219237.pdfIn PDF document text
    • https://toocapen.com/files/36429354339.pdfIn PDF document text
    • http://videocycling.info/files/file/dekefipixiwakajoloximu.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/daxopeni.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/kubopuvaxelaneliv.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/gedogijabazid.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/pisano.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/netotuvepinumetowupe.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ca3d7af95---wuwolugabuzinarisinotor.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/mogalewiwomamipelu.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/fazavepiputuwijifep.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/40389429970.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210917205806972.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/42521882995.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/xujewuna.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/31117833027.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/bedigorijexarakurimep.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/ziriboxamomobaga.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/japubo.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/guliripamapenifoguxeko.pdfIn PDF document text
    • https://panoramabyty.cz/content/sipajigimugojot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+convert+pdf+to+word+doc+on+macPDF 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_off0000c67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 16460 bytes
SHA-256: e84841483ea8c587433eb96adac20922f955eaaf3309c72017fab60bfd944e97
font_01_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 10620 bytes
SHA-256: d304779acfc388f64c7abf1dc9e362b99dc4ab1273c8a8b61718860c2dd49938
font_02_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1