Malicious PDF — malware analysis report

Static analysis result for SHA-256 7168f4635a0223fd…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 14:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bee2b568f5f1e2072e783d89d268b74c SHA-1: 1bd32cb580b71f9b50b35d7a3183b4933e956e78 SHA-256: 7168f4635a0223fddfd058930f97a0929c44ad0687807649bd8800a3eddd2683
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nutricount.cz/UserFiles/File/pidotobajasug.pdf In PDF document text
    • http://puntolinea.org/userfiles/files/linefuwomus.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021912845472441.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/27311539456.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/8303640292.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/zutupuwumodup.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/37078577865.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/8821379045.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/sodesipugibenelevuragozu.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/xonomegidogapasegotekago.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/62499730701.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/71897346525.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/62544638284.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/87234375149.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/42118149055.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/81474ca5825307141c7a7ca76af2c769/71713554964.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/gipepawozato.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/babakupatasomawofut.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161419069315b4---99982251257.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/menodowowapujuvuxazuvoka.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/30012496719.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/kuxejizakekumewiji.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210908092425.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210917_748BD087A6B00E12.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/nugijegelodemironovesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=local+tv+for+firestickPDF 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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 17864 bytes
SHA-256: 0a64f9e6a54da69dd70a74eb72ba2debd4455bc4925f9bbe60221589c4137588
font_01_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001195b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195B 10340 bytes
SHA-256: cec05037bc87aea1d2319ea735a85d517a47ef1a647f36cc1ee8e123d743702c