Malicious PDF — malware analysis report

Static analysis result for SHA-256 837761880559b09c…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 00:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3352bb71d4963c4ef7423fcb9feaff0 SHA-1: 1a678dbd8d11ccbeb0ee8c835ef92abdf3630c56 SHA-256: 837761880559b09c405635668a0b8c82b48e3c289219c9c78391d9a8d1276576
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=webm+to+mp3+converter+free+download PDF link annotation
    • https://kujainspectors.com/candyticket/uploads/page_images/files/50369960169.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/xirifupigopinojogolawu.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/jadum.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/84757110931.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/niketujukudisunig.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/79895606011.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/2691913818.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/91655180477.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/52621269590.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/28818774886.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/vafewimefazukagofumusaru.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/58223415224.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/nodobob.pdfIn PDF document text
    • http://bptramptour.pl/files/file/midasimof.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/tuxosu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f96c0a266e---62649158422.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/vibewatulazaja.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/67992974723.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/luwubozelevoselamoz.pdfIn PDF document text
    • https://dalba.net/other_files/File/tuladiwovivaru.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/jukasefozufiwugumine.pdfIn PDF document text
    • http://vhz.cz/user-files/fenadadidap.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/dagirazitonijikakufuse.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/tuxagowuvorodamatojipigu.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_off0000b294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB294 10976 bytes
SHA-256: b25248238ef144dd2377d9d62836ccb314c6ed9af860298ba1cac9e29b73a060
font_01_sfnt_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 17928 bytes
SHA-256: 7ef6c6c4fac64e0a76e1a4c549c68c844a081aba0731a7284ddf9bc1068ba4a5

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