Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e45380be8c6005a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 08:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02f0b469af1275f7928660db9121d595 SHA-1: 6730afb4ed3a5ab36f77cbb4934a8161175e91ff SHA-256: 7e45380be8c6005ac8e6284d21312b1e02217fc10b71731bd103fa9767d5754b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161407ece6a90b---49236933710.pdf In PDF document text
    • https://sistemagestiondpr.co/userfiles/file/1695150532.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/midudezewo.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210916_085423.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/wewojiwasawuzo.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/73154198891.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/80833364494.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210903233359.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21306135390.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/46814404655.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/xukapomiworewufilajekusid.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202192848589609.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/17249162360.pdfIn PDF document text
    • http://guowangcable.com/d/files/pinivopovibigubulon.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/zizisogar.pdfIn PDF document text
    • https://mkontroll.hu/File/pimenolexizo.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/gisusugonejegoli.pdfIn PDF document text
    • http://12shio5.com/contents/files/15391597480.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210901_5D97ADF957109F0D.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c973fc8eff937816605954708c2b979c/87395952976.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/88378420042.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/63531680198.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/nuxubewarugisidege.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/41187425226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+transfer+app+settings+to+new+phonePDF 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_off0000cdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 17804 bytes
SHA-256: a110eae62000da5ae80c488099af58185f6dd76b2539335026ffd4414771b311
font_02_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 10796 bytes
SHA-256: bc5a23171f58c0163d51c4e2726f8ac08f5295e5ef379d8844548faa681231e5