Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b57b87844b2181a…

MALICIOUS

PDF

88.7 KB Created: 2021-09-16 22:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e44186a5cb174a7ef9e202991a0f8b0e SHA-1: 4c7edddd45ee5f69dd6760d27a38b49d39ae8b76 SHA-256: 0b57b87844b2181adf207eb6314df6a2ea645ec22a560dd1e32e5b0eda8819b3
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social-engineering lure to trick users into installing browser extensions or updates. The embedded URLs likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://catamma.ru/uplcv?utm_term=english+to+bosnian PDF link annotation
    • https://drhuanghair.com/uploads/files/202109072346199956.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/93533719152.pdfIn PDF document text
    • https://wonkingchina.com/d/files/16003548160.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401ffdb80fa---gosukowa.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/zulub.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/safugaxadekekujuvu.pdfIn PDF document text
    • http://ashioke.com/images/library/File/nitofotivekaxadokejobon.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090722220764619.pdfIn macro / runtime command snippet
    • http://asustainable.com/global/file/1060980785.pdfIn macro / runtime command snippet
    • http://celesteandtorsten.wedding/images/file/zurusibexamogan.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/73033668236.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/duxowagulaxutorigaxow.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/58376971762.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/21572277943.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/74397377465.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/6207461142.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/87598822040.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/demowevipilubiraga.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/wozufesagepefokabexepuzig.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/13949394913.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/mizim.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/29118273414.pdfIn PDF document text
    • https://eurotig.ro/file/84266628796.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/xasajopujufutu.pdfIn PDF document text
    • http://ashioke.cIn macro / runtime command snippet
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 21900 bytes
SHA-256: 89da5a0a25171ae868a058a69b200db4b0d67abea4839e375132367b927fc12e
font_01_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 16352 bytes
SHA-256: 2027d19739516e593f7e117cf019dd93d3d57470b13da77e2b9deb25b592fe9f
font_02_sfnt_off000125a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBD 10276 bytes
SHA-256: e7356ea79bfe59ecfb5772855a4146adf88652efab616f7875bbb58060903fb4

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