Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcbe2abf5b4e572…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 23:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e29e9201fd4bfd3ee0bda4c39c769d0a SHA-1: 56881576aa2f7b564a4297eb65aafbaec71247cc SHA-256: 9bcbe2abf5b4e57262b978e505eddb23b4efec54a0ce50cfd1a5d53fdbcf3ab1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=what+two+colors+make+dark+purple PDF link annotation
    • http://blccy.com/userfiles/files/tekijezonalixixeforuduwo.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/mipafixefimadodavelukis.pdfIn PDF document text
    • https://activepymes.com/pub/file/kidutofupavesidepujimo.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/vogimevup.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/xekudopitubikunujotutipi.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/72097518555.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/93718507691.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/vamobok.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/figelibozilejefes.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/82706636638.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/levosenuradapelutek.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/metinejiroved.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16138709e3d483---80777120060.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mukotabotobevabasurada.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/moruranutaru.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/4030307233.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/rawilemore.pdfIn PDF document text
    • http://nscenter.cn/upload/files/makinatosu.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/93905109211.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/81554708959.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/bufekojenulizazikotumogap.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/81567434710.pdfIn PDF document text
    • http://biomehl.com/images/content/files/5662950483.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/7548333181.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f9b8632ed---48121244920.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_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 10856 bytes
SHA-256: df80713d2703aa2f068f540b288e74c9258178f6927fb3dc6f8f5072b36d8ca7
font_01_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001103a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103A 17748 bytes
SHA-256: afbac8dcf9fa62e1eca0f8204726ec20b84fe888beadfad2310879635572bcd3