Malicious PDF — malware analysis report

Static analysis result for SHA-256 043466736e83427c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 10:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96e83ea6750b1986ec11f98d08a0e95d SHA-1: 3395455067ad259528bf6e2cc94dd146acb54dde SHA-256: 043466736e83427cd9af002854f4530f6a880b2f10659db9c2ab2d057f872ea3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many pointing to PDF files on disposable hosting, suggests a link farm or phishing lure designed to redirect the user to a malicious site or download a secondary payload. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=best+haircut+for+my+face+shape
    • https://angkaganjil.com/contents/files/fikoj.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300843130c4---6989990588.pdf
    • https://houstoncoinshow.org/FCKeditor/file/rarutiluzutunifo.pdf
    • https://thuhuonglacquer.com/uploads/news_file/zonowemip.pdf
    • http://hondasushi.com/uploads/files/3434984591.pdf
    • https://qigoodteam.com/uploads/files/202109051023149615.pdf
    • http://geoplan.su/userfiles/file/wixiwonegulifitadavoremux.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613579ecf3686---fadesuvetite.pdf
    • http://mateuszkucharski.pl/admin/file/wadimipidegobariwediw.pdf
    • https://trainova.com/userfiles/file/57440706813.pdf
    • http://belniig.by/public/file/42758134504.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/dawolokibifutelakex.pdf
    • http://sinorarechem.com/upload/files/difovofoperufijori.pdf
    • https://toocapen.com/files/suvuwowekizit.pdf
    • http://encino.ilovepokebar.com/uploads/files/16033309696.pdf
    • https://tectrongim.com/uploads/files/18726869395.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/23522270045.pdf
    • https://araprinter.com/ckfinder/userfiles/files/fesabeva.pdf
    • http://artio.pl/files/files/26200004210.pdf
    • http://jngf.cn/files/file/91476792401.pdf
    • https://korovin.org/site/img_ufiles/3288542117.pdf
    • https://vayamcs.com/content_files/files/39755502948.pdf
    • https://sweetburden.com/upload/users/files/93330246671.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 16792 bytes
font_01_sfnt_off0000f530.bin
c18912b0b9aa0d9572baac7d4cfacff398f12ae87a74a89fc2ffcdfde0b4a20f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 10860 bytes
font_02_sfnt_off00010e64.bin
0a0873edd88aa8bfb75fdc769ec418369afbf591f090a222e39b0bc8f28a7ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 18272 bytes

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