Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7badbc29eacc0fa…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 12:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 088caaa1bde983bea0f2e962593cab7b SHA-1: c34437058c1a4df212ea994785f0919f253238f5 SHA-256: c7badbc29eacc0faaa5544af1b655c036c98e31bc40d66ff574e1d8fc130b042
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://allytemp.ru/uplcv?utm_term=android+12+widget+kwgt+apk PDF link annotation
    • http://lightningriskassessment.com/ci/userfiles/files/miwer.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4e30e534---15227411223.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/49i12rucupjsv0tvlr9v0vodq0/naxekupobizaxufag.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/kuteped.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/77252548491.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/kotinemomarotosikoxebo.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/69838086501.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/9653963949.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/87494967107.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7evhi7s5lgvmna4tali203n9k6/50129931477.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/7228801574.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/51442999740.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/60796537191.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/jogulojixitegetar.pdfIn PDF document text
    • https://sitarasign.ir/data/file/57340294649.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/98618341919.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/35191668118.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/milakinidugevupa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fokavokig.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/pewaseparobanuredal.pdfIn PDF document text
    • http://coolscape.info/images/files/18700698025.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/20165472450.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/fowuj.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/kisog.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/9972499880.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_off0000cc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5C 10684 bytes
SHA-256: 65748fbc2725ff442ea3ec3cd7fd18d204d3558bb782f739fb2700617ccb77e7
font_01_sfnt_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 18916 bytes
SHA-256: 112835d9ba82bd5d3c426a126713f0e693575fe9505ce6dbc9042f9a134233e9