Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f32f43a5db65b2c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 00:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65f19a51e6e148ac494230eccccd8619 SHA-1: 671a8f52c666dd70829b9213b13da360301fc7f0 SHA-256: 8f32f43a5db65b2c995ae39161cb7ee21243155aec344f81998f2845b71121ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://agrobud.net/uploaded/file/57085700837.pdf In PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/60785706126.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/rubobur.pdfIn PDF document text
    • https://coevent.ru/upload/files/nadimefitulenevogegigu.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/fibidanokabotesan.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/gogexasovozenixunaf.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/zafefik.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/misekawe.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/tedumipomonos.pdfIn PDF document text
    • http://azizolace.cz/images/file/97781028943.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210913020110.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/97060313ab348b6d457180cd79eb7854.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/2026351346.pdfIn PDF document text
    • http://lovesenergy.nl/file/kuvebasekus.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/75636011116.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210902_044521.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614263dbacff1---pidolurodezavexukesavuti.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/78445950182.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/65183073008.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/didevaxisukimavepupolobop.pdfIn PDF document text
    • http://mylodge-naoshima.com/62970147770.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/52994845067.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/rozetafa.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ge05dmoi5qsome32m6ft5davqv/jokiwebewivununuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=free+calls+and+sms+tracker+app+downloadPDF 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_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 17360 bytes
SHA-256: 6f008c8aab92ea8f5e5519ecc312932fe0c4d1bec4183ffba8698dbbb7254b12
font_01_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DE 10736 bytes
SHA-256: 9c20fba71d94ba5b41909ffab1bfeea1ed137a83dff292d2743bb8099c757a1e