Malicious PDF — malware analysis report

Static analysis result for SHA-256 7834552bfe9b0b1f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 14:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7d7961f2bf9d5b2d8ba42b44d4db3c89 SHA-1: c89d025852e3f419a184f8bf02eb7e6daf9eb0fe SHA-256: 7834552bfe9b0b1ff26f0fab8e6018220b6085a10ac0b674724f1d604b359aed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=demon+slayer+free+episode PDF link annotation
    • http://decom.pro/admin/ckfinder/userfiles/files/60263615507.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/sukajamuzisuze.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/memaxovimobajirelinuvedat.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/tuxisaboxidus.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/pufidetavexodelixa.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/99126955828.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210912043639.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/39944584914.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/rurerozijijixexakomateb.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/duvuvuxuvaxupofipasu.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/94444872107.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/jetokogilokikomawasuv.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/zezuzulegubadizufuzuxegan.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109111810527449.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/dabulefob.pdfIn PDF document text
    • http://ruihuitax.com/files/file/najosufokedidugeragok.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/4824837799.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/wekatamatawawopizedefos.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/48777225682.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/82918039127.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/82915978953.pdfIn PDF document text
    • https://netlandschool.cl/files/70417074774.pdfIn PDF document text
    • http://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/remunelotezu.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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 18060 bytes
SHA-256: d3fba1e747bab124f75a717e77dd5040458928a84b07c9e8f806e6a978a68b3e
font_02_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 10676 bytes
SHA-256: 607f8a8fc5056745a6ad532d38a48c5c7ce2359b650a1f8fc7da98bf05cc0db0

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