Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1abc8b68b12a2e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 18:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0800575497a1daf2ae27af4dd0b64b8d SHA-1: 9044fda2f0f8855034779a483375641096decd4d SHA-256: 9d1abc8b68b12a2ebcb7190dcbe417be7e4a2a2fb9ac98ce58a39d013a36c89d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO purposes, likely to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://polletnv.be/uploads/files/mebizofopipal.pdf In PDF document text
    • https://zzwgjx.com/d/files/dipirupasosilagukeluluto.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/rolesakejetonusutefi.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/wukurajos.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/88003062345.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/99093129988.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/85712826277.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/defuremipulemeludezuledi.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210916030139.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eefa559153---tezagizelububebive.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/71999807407.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/lidivonesegaxefonovo.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/45246215027.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/32786485604.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/fegupividagojupogasumed.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/14893444339.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/zunubagozilokujaxusudiwo.pdfIn PDF document text
    • http://freeski.hu/freeski/file/xevemewovukaraguru.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091717555773499.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/jejosuvaparedifalaribulol.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ab61766b27830a13d548260c9f6ef594/13116176641.pdfIn PDF document text
    • http://myphamasia.net/upload/files/36753072824.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109161102383777.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109151631505099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=golf+battle+download+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 10488 bytes
SHA-256: 684c6860173257fa392fc61e688f1c1b4aeccf08b3898f67ca7f8d4e1aee130d
font_02_sfnt_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 18128 bytes
SHA-256: 3f2ce268f0ce7f82b86ec3c1968be383c72b37f9c0f24c16043e049c6e53fd59
font_03_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 16576 bytes
SHA-256: e1488d2a53dcb6188bc308c5d7c8635584dbd2bf2b938ae8541d23a7bda16fc3