Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d983f9772692192…

MALICIOUS

PDF

94.3 KB Created: 2021-09-20 23:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 75043c3d5ca2b69b60bb72950d6bd114 SHA-1: b81498382e91b4cc2d40287071ef588bce2fde29 SHA-256: 8d983f977269219282bbd5e0855843e048d7a087b7db6a84dfaeb8bf7fb11d53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic analysis revealed it functions as a link farm, embedding a large number of external URIs across various domains. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to potentially harmful websites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://oniceh.ru/uplcv?utm_term=streaming+vf+conjuring+3 PDF link annotation
    • https://dichvuhappyhouse.com/upload/files/48609293777.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///8159059120.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/53820299269.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/pinizobifiv.pdfIn PDF document text
    • http://poliinc.com/upload/files/66510646350.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/35489730202.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/rujegapakizeserofaliv.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/rojixa.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/61745137042.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/69496508563.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/xutularukufovagonowirip.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/312b5e7d996388626ae5082e4d9892bc/vijedovegebajulegejo.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/64106415720.pdfIn PDF document text
    • http://ahchala.com/img/file/betuzumo.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/gezevalisebu.pdfIn PDF document text
    • http://hzqzg.com/d/files/fetutorusozizawilev.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324930a868a---36091415824.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/34288931141.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/71796493327.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/jameruzegak.pdfIn PDF document text
    • https://paradigma.bg/uf/file/91170552929.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/gipuka.pdfIn PDF document text
    • http://esipro.be/userfiles/file/35636794003.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/38898085985.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/71302109464.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/ziwofupozujejodozowu.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_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 11008 bytes
SHA-256: f711913f7bcc2888aeddc6db0164fe4c13295a2ec4ef16c8ec9d612a0a2c8afb
font_01_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 21300 bytes
SHA-256: a250bc631c9a504355304eb96ab942edd2994f79b9bf9ca8a6260f764fcad7ce
font_02_sfnt_off0001535a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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