Malicious PDF — malware analysis report

Static analysis result for SHA-256 0294ca8f25208a70…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 00:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7b5f412c10d7e6cc619775f3e70c040 SHA-1: 7429420db2954b263c12440d1cf78739829ab4b8 SHA-256: 0294ca8f25208a70d3e02db5dc350271d206e17996bf264a30ba8387d354dfc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many external URIs suggest a malicious intent, likely to redirect users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://inwebjor.ru/uplcv?utm_term=among+us+play+online+browser PDF link annotation
    • https://speculatio.in/ci/userfiles/files/tinofewezimixavopuzu.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/seponifegulifitogu.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/suxavito.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/guminojunegilez.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/95681818029.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/1283909030.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/komamasa.pdfIn PDF document text
    • https://novitas.ro/files/zaduno.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/jibasalogofewawonesekun.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/50947412925.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/mibuzoxipuwukubosibegegoz.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/sunatasog.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/84209941524.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/86074695706.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/35987463847.pdfIn PDF document text
    • http://plise.org/userfiles/file/lenumenejoguliw.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/selaworezijisekajudilotax.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/funubipujugojunas.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/10231578268.pdfIn PDF document text
    • https://wonkingchina.com/d/files/radozigufavaroniwuduwot.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/ronapole.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/3646250289.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/rogugamosorenilasudep.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/13242814822.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_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 10920 bytes
SHA-256: 9b26b4c4ffcf7aa34905b2895adc0a7e26dc51e346c1376f3db1a4ddaab24464
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 16972 bytes
SHA-256: 0b58cc4c79817f0cc3e5d36b27a97b8bf269816a6f51f40ca699915c3c950146
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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