Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8607edf4b69391e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 01:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b67656a58d2f75ba18219455131edbc9 SHA-1: 00018786b121a815dbf2fcc20514d19f60c129de SHA-256: e8607edf4b69391ea6dcf4a64458bd6807a13b00bf507fa70ab042fae2b6e4d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on 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 heuristic firings point towards it being used to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://cukimentescukraszda.hu/files/files/83033853864.pdf In PDF document text
    • http://newo.ru/files/files/33552317886.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109090702422613.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/xutujevuku.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/vazajozoxexiwetazafi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/709irkpv2qh9m0u64spfc0jpf6/ranelutuzag.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/tukulafananiveku.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/gamikuvofimeragafikur.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/fatonip.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/44585236294.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/lilumidinibixibe.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/dejoridavonavuzopev.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/66085415043.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/82865345254.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/71391633532.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/6070578810.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/woririfijigimipulo.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/tadatojirilotewatovoxegez.pdfIn PDF document text
    • http://yongqingtech.com/d/files/lufefebikutexazibijasuka.pdfIn PDF document text
    • http://acelybio.com/upload/files/rejademelinovezote.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa1602d3a3---71511048057.pdfIn PDF document text
    • http://rapet.hu/files/63603203422.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/36292094350.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/91647253809.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/xejixapinagumawepabi.pdfIn PDF document text
    • http://edituj.cz/res/file/fosugurosaxazufumoras.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=synoptic+chart+perthPDF 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_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 17516 bytes
SHA-256: f8f4c0d86e0a105ef9f63ee098510174246c48ab2ce7560d72b2cbfd18146114
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 10448 bytes
SHA-256: 8c4d7c6e350e63e18ad95b4475338b0f77ce79a157b0a0f9fe00eb203fdc7f01