Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec8a300b2d4d091…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 09:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 196012d7aeeccc648a2e4c0a138166f4 SHA-1: a5cecf54410d91df953ea15ce635a61c8a53ec94 SHA-256: bec8a300b2d4d091484b13a5bb52bbc11d8a61e997bdc2aaca8f059355c0e6f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=name+of+jungle+book+bear PDF link annotation
    • http://airelimpio.mx/img/editor/file/43997177360.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/fudexixovuzewegugu.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/31497104897.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/xakapofugafakebolewe.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/pemawodevigemibepal.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/bibivagusumixotobixes.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/rafunikuvemesekavamipejo.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/17217923434.pdfIn PDF document text
    • https://shinaltd.ru/images/file/26285057471.pdfIn PDF document text
    • http://www.bash.cl/media/file/pifixamiso.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/binivigolepubivigijosax.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/rekuropavotudimuwedexe.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/73364100517.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131db0dee917---41148248199.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/80548778031.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/tuvolirubononujokibuni.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/medewutedugimategoxov.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/71639273657.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dutazesirone.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/25949795524.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141fbf1e5ea9---sozikovelemeki.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/tivugalitozugati.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/dadazuzepafawikanug.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/gefegaw.pdfIn PDF document text
    • 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_off0000be05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 10640 bytes
SHA-256: 1916cb2929cb342f62c8f40cdf9f626b4dc42ef057c083a116809691d78197e0
font_02_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 16656 bytes
SHA-256: 269fed09ff5512ab244cd16c953f9e568265d72ab0f41cf0444c80ae43605403

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