Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3e69e35889399a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 01:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0a1224f5f44338307b834cc21c224f41 SHA-1: 76dd14fe8889ae4de72d6c18f24171469695e742 SHA-256: cb3e69e35889399a559255c23efa896f2b91cbc8225893dcf725e40d2fcc2be4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/2q7v8paaovb3e45oe1a51meo0e/vasapubakixu.pdf In PDF document text
    • http://ultraljud.nu/bild/files/bunakarozanogomu.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/54822244714.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/mutojuduxiw.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/29403736245.pdfIn PDF document text
    • http://birdwatching.sk/media/file/18825840218.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/14678776997.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/wafisirogosipatiwido.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/22210109632.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/35599216261.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/79345282711.pdfIn PDF document text
    • http://praguetransfer.com/files/file/30388199536.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/25688858982.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/nijazi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3e0741fb---benaxu.pdfIn PDF document text
    • http://indemo.pl/Image/files/tuxivalusixelavow.pdfIn PDF document text
    • http://52963566.com/upload/file/202109090111316042.pdfIn PDF document text
    • http://email-database.info/userfiles/file/23426945438.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/89333058135.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/mebilawuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gloud+games+free+svip+apkPDF 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_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 17136 bytes
SHA-256: 75ad4743e652b910ffa31b71349a5111ad021ef5107fbd10052e4e8530cd17b0
font_01_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 10936 bytes
SHA-256: 2c8afec96d28c7df6505964bf8ea412e955039a30d9e00e684ff3acf7fc2d73c

Open this report in the interactive analyzer, or submit your own file for analysis.