Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc077a0fa67872d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 11:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb1b11a698ddcccb702e90800c539630 SHA-1: 4c8d9bc5215df36e5bcd4a8d29fcf026131cef3c SHA-256: 9bc077a0fa67872d894a505d5d3caa77310a3fb3eba12565f213eedc81e632de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://catamma.ru/uplcv?utm_term=squid+note+app PDF link annotation
    • http://palami.by/images/file/mubot.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/forugaxeredidupuxawe.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/bezoxeba.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/pefekufoxotipixo.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/sisemi.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/ropudizigo.pdfIn PDF document text
    • https://mauspro.net/upload/files/56866440613.pdfIn PDF document text
    • http://adveotec.com/img/file/43052250391.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/29144379309.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/keradov.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/kufujibigavolezizago.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/rakigegu.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/fexumifisijigotuto.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/6414186229.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/gidavekikexekikunap.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/veninet.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/95886612746.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/24625431104.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614584a60cbdc---likedetagitub.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/vinudirogetebijonilus.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/pujivan.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/gotumilobabus.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/jirazokizuzomepof.pdfIn PDF document text
    • 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_off0000cdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBE 18196 bytes
SHA-256: 297ffa6ba9efb080b0c5f6530cb667ea5fa5befc08b2545410ced1010b14b3f1
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 10392 bytes
SHA-256: 787c3edd97172ba27f17295f7f715082e69a009497813276431516f69a0e37ce

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