Malicious PDF — malware analysis report

Static analysis result for SHA-256 904be83d1b6e4df5…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 05:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96506b90d19c16cfb629a9fb538e5efe SHA-1: 025f979623544064f53c39e57a4f04d02c39be79 SHA-256: 904be83d1b6e4df5a70d02798571599a70e551a8af2ae1358716fa411eb3b607
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, 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 related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://crewmak.ru/uplcv?utm_term=gta+vice+city+file+for+android PDF link annotation
    • http://weforyou.it/userfiles/files/pazenewagonokojikopes.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/popubitarifomanirazimav.pdfIn PDF document text
    • http://ccadl.com/files/20210909221333.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/29505744014.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/kigesifepoxazujewono.pdfIn PDF document text
    • http://foxadv.net/file/85305522858.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0a6a1c247---95875708024.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/jumevunepa.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/sadudokizakofavaxagosef.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210905_094903_200.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/84306257346.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/jusudibovog.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/92994544175.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/suvapuvinijerozug.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/govinalegagofu.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xevixukovojivovenij.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/jugam.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/zidaviwukunaze.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/80158784698.pdfIn PDF document text
    • https://ibericadearmerias.com/file/40893357328.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613591c63617b---jusufus.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/6248659325.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/fodufinuponuwe.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/20915263492.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_off0000d1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AF 10520 bytes
SHA-256: 7ba5753b878ae89e6b11e2676e2fb22785aac495ee3e0a4d85a6b3166ab63f82
font_01_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 17300 bytes
SHA-256: 94da846a3f6560cb75f6ecb2f5989e7c6d8608c8b9f72a71eb73e47d96942573
font_02_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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