Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be39c2481ba74e6…

MALICIOUS

PDF

67.7 KB Created: 2021-10-08 18:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ec9d3ed9bf1933dfdd0d78c85e0a4be2 SHA-1: 35ef6441055c3fc746dfd7b01b4efc87e6b6c90c SHA-256: 8be39c2481ba74e668e59adc6b22fe7f907ce95876627fd82b212075757f9187
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, employing an image-based design to conceal clickable links. Heuristics indicate it's an image-only document with an action trigger, typical for phishing scams. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable domains, further supports this assessment. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/ladotoxatemunuxures.pdf In PDF document text
    • https://vialivonica.eu/userfiles/files/puxawutevo.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/36135355507.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/memomeba.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20211007122048.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/97370157649.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/zexojutazi.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/92110925442.pdfIn PDF document text
    • http://grafittipng.com/userfiles/files/87644675148.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/milokimujenitutozuwon.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/mulefotu.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/lukenepeviloxumusoneb.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/fejovemaze.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/rapavafesujasezudane.pdfIn PDF document text
    • https://senfina.top/uploads/files/74540941717.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/razixokamuwizuvegenuziwoj.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/30481744293.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/77799504796.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/36673227969.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/zosobevetafekobeseni.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/mafuguposalobiwef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=proving+corresponding+angles+are+congruentPDF 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_off0000aed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED1 10856 bytes
SHA-256: 07a6dd942746d046602323185f5086277aafdf685d576e8e2692017dd4a6d540
font_01_sfnt_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 13636 bytes
SHA-256: 1a11f3086cf989ffa30a7110de67f1c8badc4b6fe08685137868f7d65f03ad0b