Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae28984f09ad0a7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 23:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8094840a27d23215bb31fe6561b36b18 SHA-1: 6ad75bfcc065f39fe0e65860acbcfed5ea48ba96 SHA-256: bae28984f09ad0a7ceb3c48d806613b043566d0e13bc375b313417306d8b61c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm with numerous URLs, many of which point to PDF files hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://simsvizag.com/contentimages/file/botaxijofisofawim.pdf In PDF document text
    • http://donghobaoan.com/uploads/files/lamipenojija.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/lufabazixipigosesojok.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/luputotipete.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/tixifizasubol.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/10380670611d265d6234b5088880b3e6/soporigadaraf.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee31a1127---53700610340.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/9050571837.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/damavudujel.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/sepevogerusidetewex.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210906070738_261025166.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/wepogajudajunepupibufob.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/mejugotal.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210902091523.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/bizovofazojevusu.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/24946492747.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/31371127261.pdfIn PDF document text
    • http://cataga.de/beta/files/file/29951906644.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/noponemulezibuza.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/moramugabu.pdfIn PDF document text
    • https://hoavily.com/uploads/files/14217808317.pdfIn PDF document text
    • https://33mobility.net/uploads/files/vamenafivox.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/30418367504.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/10470825032.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/81078089930.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/98841146030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=equivalent+of+siri+on+androidPDF 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_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 17156 bytes
SHA-256: fbb84e17ce85174fe737a2c2bce39698e43fd3a6289b6b9468c9d6188f07b97f
font_01_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 10640 bytes
SHA-256: c269822c2e2403fde2e7488b7e4c5ca571b722915504094196015a59d5e467ac