Malicious PDF — malware analysis report

Static analysis result for SHA-256 da93018a50f66824…

MALICIOUS

PDF

70.0 KB Created: 2021-09-23 19:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c153a0ff2c2924adf122e364eebb86a6 SHA-1: bd72178c5ebe625cf088313402baa23c821a9ad1 SHA-256: da93018a50f66824e312566bb72041520f76b5636a1e96331da23f901da72dfd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a phishing or link-farming scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://dagvandearchitectuur.be/_files/file/pabebemenunatudaxazofux.pdf In PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/80661422004.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/noligemoge.pdfIn PDF document text
    • http://okun.su/upload/file/27566258950.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/dunekila.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/jimawutotamevigo.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/55242252317.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/60794981960.pdfIn PDF document text
    • http://xprchemical.com/upload/files/wegubedekuxitoligodigupu.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/zosalexalabafe.pdfIn PDF document text
    • http://synergyproperty.com/images/files/67882456062.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/39212596396.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/nilumiwuja.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/14410164462.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tekenik.pdfIn PDF document text
    • http://houselandia.ru/files/65692613958.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/tebakamidunurajulavagow.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109060803091137.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/55056367603.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/pamibe.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219497205413.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/8003846153.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/14998532479.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613908cbda749---5549138635.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/xomexib.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/rinapisepoxo.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/20153073015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ariana+grande+something+bout+youPDF 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_off0000b4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D4 14516 bytes
SHA-256: 008e8932940aefc176b6098f53423bf950008e893cdf093fa3d73d4234b63477
font_01_sfnt_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10984 bytes
SHA-256: e90ac92f49d65cf19f16638870b5eed0cca1ddec787c79031d010bddcec4f174