Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ad9174749577bc…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 21:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd494ea59979bc2655ddd2ed7a219fcd SHA-1: b06fc97f6587d0f0f8de90beb19f8458f5da9684 SHA-256: 71ad9174749577bcd4a68f03bc4d7e30053830c73f5376f7ca84b2df1729f15a
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 identified as 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 used to redirect the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://imosa.asia/uploads/files/202109051421006291.pdf In PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/sowarofilesemapabediseni.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/zitupotijupisuwuwutoga.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/jonakukaxuj.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/gigapivasorekaronumewalu.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/69588990058.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911155100.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/suluxodufupakadiwefele.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/vinowixumebo.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4nlv63adukam7lt80aa99k6fva/fosodapawefokuzobeluzap.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/lujame.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/23991852040.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/mizexoripaviloweroguxuwe.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/tukepomuxibebize.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/75374470478.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/fawugekegujawobururoba.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/fobudeladebomu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/28799939804.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/83623843249.pdfIn PDF document text
    • http://creationart.hu/files/file/55566536867.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/savumokupa.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/81652121451.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/19094988787.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a91eb368---temazavojutazifikigive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=moto+g+5g+plus+custom+romPDF link annotation
    • 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_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 10456 bytes
SHA-256: 61254e32a4f040aeca0e30602a6512d06504d979dd4a5658b57d71631b41a979
font_02_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 18112 bytes
SHA-256: 03091617c75ae6353e8f49d0a63156378f5feace7ba9cebeae3a7e867adad99f