Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1ed08634c84c00…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 05:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86931723b6536ea412c31ab057d718ab SHA-1: cc886e562f6567d6a0568a99534fc3f96d56c814 SHA-256: dd1ed08634c84c00d8d913047b6cde109196dcd9748936e769688fe67a7e6778
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious content. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://mlbcsimleague.com/ckfinder/userfiles/files/16279694382.pdf In PDF document text
    • http://studiolegalezullo.eu/userfiles/files/majekunezuv.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/96cabf72a59dd93b8c0750ece09fc277/96457359484.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/59029816806.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/6033185269.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/13057366768.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/90044081860.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210914_F94267DA9436AD4F.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/65566933538.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/44987570582.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/29421668300.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/jaxubafezijub.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161396ca64f93d---71549279042.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/mimimumen.pdfIn PDF document text
    • http://risme.vn/files/xazotewulevimus.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/25767599302.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/bofadizevezusopedolenev.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/jawuj.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/xadelagemumugim.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/23018815257.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_4299083DAD484297.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/1209077197.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/begesupizekabamutitoboku.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/9866931666.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/46211321725.pdfIn PDF document text
    • http://mobilenmr.com/files/files/xosegexuxagaxilerudediz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=memorandum+report+formatPDF 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_off0000b673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB673 10448 bytes
SHA-256: 72b32e2caf613bd8f65cf9f6d6b325cb07a78afda8ed2bb19b8dd4ce0a336ebd
font_01_sfnt_off0000ce13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE13 16304 bytes
SHA-256: a7a1b3c204dbb3a1bea3e2853222e869dc2cd60b92346f2ab91292795865b300
font_02_sfnt_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1