Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3899a016113b916…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 03:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef4c162aba05f6ddef13831da297016c SHA-1: 45370a0010d73d451bd5ab52de9222eff3ac04a5 SHA-256: c3899a016113b9163e7a90d62562de384a60f4a7058d0e1587e85f665f9ce9e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is designed to host many links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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=ghost+touch+redmi+note+9s PDF link annotation
    • http://erodiertechnik-wenzel.de/userfiles/file/76266821248.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/lunerezitubazozil.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210912064624_102993734.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/bubaxunadi.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/fizesen.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/dupuzewir.pdfIn PDF document text
    • http://519pf.com/userfiles/files/45803192251.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/zububovatisigunozaloj.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9b0220d22---daxob.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/bewugopesibizugurul.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/80668559045.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/74456544143.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/kifakepixorepobilu.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/fabuzelixul.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/paxewalepofixaru.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/57707599203.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/legunedikenuririzexupej.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/mogizunugijet.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/vuxetorosiwejunut.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/fipuxirididanaped.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/3027303090.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/sisisuwoguzobi.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/ritomor.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/56905810506.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/s4g6but1687f8o99u38065fs3a/rorekur.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_off0000c2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EA 10736 bytes
SHA-256: d8770fb26b3934bef5a0e1cba8a79208da56cf3c42286bbfa4e69ac0cf6bd874
font_01_sfnt_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 16224 bytes
SHA-256: 06a972c2b7b98ea5a5c75075fab9269142208b4253380d5abe7f49830707de65
font_02_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1