Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43552a2c8deb2a5…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 14:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d37c858bd0bb1cce680b258808efe58f SHA-1: 011582d30fecfbc77d2faf3b91f0a60aa2a63db9 SHA-256: a43552a2c8deb2a552c98c718e787dfde1dc338a8c801747ecdd7e7980b67df0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://shinies.ru/img/lib/file/todenuso.pdf In PDF document text
    • http://cppzone.ru/users/blogs/file/kabajupefirafuwizutob.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/nabol.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/sekulikuwumowolubumi.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/9678268407.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/divijew.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/79252652435.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/54865882128.pdfIn PDF document text
    • http://envigest.cz/upload/file/88498914456.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/16c082c6e6de5fd04a4551cc20f4b5d1/53316484578.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/turekezi.pdfIn PDF document text
    • http://agrion.org/upload/fichier/34920003311.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/74595422403.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/59481703349.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/38163634466.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/92058962570.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/zoterawofepo.pdfIn PDF document text
    • https://trystsalonri.com/images/file/88247693659.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/sinevinoze.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/foravekosexu.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/98734696270.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0960038b---9923932778.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/11237822010.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/sidev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sports+car+challenge+apk+dataPDF 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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 10868 bytes
SHA-256: e0e8b4ffda6c009e8f15eefbb5db467ebab1f9bc1158680679caa8d0e60f3a4b
font_01_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 17628 bytes
SHA-256: 9f8a3d64adc12e923ec4cc98a65704f7a65e584fbfbe4db6191de6f15834c99f
font_02_sfnt_off00012b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1