Malicious PDF — malware analysis report

Static analysis result for SHA-256 81336489b7068276…

MALICIOUS

PDF

84.1 KB Created: 2021-09-23 14:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9ad267c252b27fe9fbdb1f43f053eb0f SHA-1: 9b7137eab4bb397c04ee86c218866792be5d9ab4 SHA-256: 81336489b706827685fa7658cd3fb2698876c3bd8f356958d4252f11ccfa6d26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9912

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 https://coretry.ru/uplcv?utm_term=tolkien+monsters+and+critics+pdf PDF link annotation
    • https://aptitudeclass.com/ckfinder/userfiles/files/jifuzexu.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/35383858617.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///43363821810.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/sunedebesakigibofo.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/nulonatolosimumikivelitiz.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/dugiviwetasibone.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/jowivewelizum.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/62567820154.pdfIn PDF document text
    • http://th-hl.com///upload/files/lekederapowutokigopa.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/mujosutapalalasure.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/gimogelolakas.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/26802437015.pdfIn PDF document text
    • http://parfumland.sk/upl/mesowomow.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/fadekikusarovubo.pdfIn PDF document text
    • http://villkasz.hu/editor_up/gexosixazunorogonajukema.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/rigeluditudaxodi.pdfIn PDF document text
    • http://webursitet.org/Files/file/devudazugotobitisutumaja.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/madexinokijumodojuma.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/wubizurimukedum.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/04937954242fdbb066ca928d88978228/relagomilopirinebuboxaj.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/bematamodipukuxije.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/xowisiraripololixela.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/28722677116.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/34936631799.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/39636692488.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xenodulir.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 10836 bytes
SHA-256: cc9ed24a1b1f56463c8d4b1be81d6abe82770714605f821d705c5d8351d817e4
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11392 18296 bytes
SHA-256: 63e32c3beadf9be382454932df8a6e72c1113732970220624474323437b41f92

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