Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84c48177c0f6e42…

MALICIOUS

PDF

102.2 KB Created: 2021-09-19 09:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 522cad6c4d6ce39db8d87fe802a3ead3 SHA-1: 00fc25fe5401f1ef54ab5c8dc8ea7309b3bd0583 SHA-256: e84c48177c0f6e427349941f493255142080d372d88cc39b7dbfc66fb543db33
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous 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 phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=msn+weather+gadget+windows+7+download PDF link annotation
    • http://zap-interactive.com/uploads/files/guvuna.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/lubowarujiban.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/gamiwegas.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/xomiveguka.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426486edde7---kibumemifobov.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/29004520921.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/bowipenarezezedavazi.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/75118039347.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/20827032630.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/25401961440.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/32375506958.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2d99b866---sowavejixa.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210912044836.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/41804636535.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/4606382735.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/87258844405.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/tazuporafigigitu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16136a94ece87e---43742921806.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_off00012786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9D 10656 bytes
SHA-256: ca3c7de792c8d144b59d93d06163d2ce9092c192da726adffd9f55a2ace22402
font_02_sfnt_off000157d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D9 19596 bytes
SHA-256: e6119019c990eae321aad2a106f9814dc23cc3242e33d950bf06e5698eb0952b

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