Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fc380bda0cb727…

MALICIOUS

PDF

82.6 KB Created: 2021-10-05 15:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cf506cb411e64b1004c12498f85e599f SHA-1: 694b1cbcb9647ba2f3698c7ab4e3054416cc922c SHA-256: 86fc380bda0cb7273fa534053833044604577e3d543001ee54d6ba843c977ea6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://medvor.ru/uplcv?utm_term=character+reference+for+student PDF link annotation
    • http://ustunongel.com/image/files/21464134532.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///gifopowetimusulusite.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/61176742654.pdfIn PDF document text
    • https://noventa.cz/media/files/file/78427467113.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/budaborerajil.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/91180758924.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/57380442651.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109161528469754.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/23923695815.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/zikep.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/39443503571.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/9914818829.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/tinute.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/dirakadabajakof.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161535cbb908d4---loloxukogigepebitofi.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/71060980274.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/rileketewozepiluwol.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/37691589741.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210924191233.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ab693c220c6fd7e4924212a7ce421ded/pimewisarolun.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/digezeditokanogubukilo.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/55713245061.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/27831478265.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/4286599215.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_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 18528 bytes
SHA-256: a1c08088f91e74903d77473dcd1783d2c80dcd50ebc09fc8715cb88b07e3117c
font_02_sfnt_off0001247a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247A 10564 bytes
SHA-256: 174e0de80177cbe0964c0ba06926a15a5ea093fa86034e6551adabb2f4f2b8bf