Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed32a42743d82182…

MALICIOUS

PDF

124.9 KB Created: 2021-09-10 03:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: becfc8a19b981d406f6e644c351a3b6c SHA-1: 3dec599d16aa83e0aa47e459e99f29a0948a51ae SHA-256: ed32a42743d821825c84b107a95c12fb10bb7d748905257ef7e325745eabaf4d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, strongly suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://kukdae.com/files/fckeditor/file/ritisolamovajufapugazapu.pdf In PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/8226098241.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/pipanefetigusapuzaloma.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66586692191.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/bufuladisaruko.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/11574250232.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/gofuzebuburivesi.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/79240897920.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/zavurogitiboravefirin.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/defaxisirupukaxutu.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/37305064852.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7889185f---3134886768.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/86302881668.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/nozawitewijitatod.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/65096638845.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630863443_8b4ce85c7b.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/buwivimukelusaf.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/sorusutegebagevozuk.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/migosufelegiv.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/78574518718.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109051028583365.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/83158458237.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/86351127627.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/57028864631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+delta+emerald+mega+stone+cheatPDF 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_off0001822a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1822A 19300 bytes
SHA-256: 35949fb79341b2a22c6aef3b28e1607274d97070d139a88fd1b9bfb6d6b3e881
font_01_sfnt_off0001b4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD04 10816 bytes
SHA-256: 8674896b5a2ef19736b445a46b7367a912e798d5d3022c7266f82902c15d6cc6