Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b08fe5acdee3743…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 10:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4442c72d04eb5fd5a3c078c5c3316bd8 SHA-1: ebeeb4afadde171af6a5a9a1a800ebb4830e8b94 SHA-256: 5b08fe5acdee374373bb686830327dd3c283e6d0e63e6a795d995a8b69450d85
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic indicating a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://dogable.de/userfiles/file/pixudodogivako.pdf In PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/larivejipowakag.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/7899112381.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/lipedateparo.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/badulanidul.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/xivezepuwokuxaze.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/delotow.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/wolodusemogutozop.pdfIn PDF document text
    • http://halmar.info/userfiles/file/kerofoxarodovesatanitod.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vikutovukejilupowadobub.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/47533869907.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/68042388040.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/59657927313.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///72443193516.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/82883352896.pdfIn PDF document text
    • http://93564497.com/userfiles/faxeneruwibemexa.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/jedetale.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d03e5ca98777b12b1e3de31fdfb38b99/12229739380.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/85144016665.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/2870886028.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/98378937775.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/18402306698.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/lerefemukenubudogofa.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091418231668.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a31155fb---gufofud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+wifi+connected+but+no+internetPDF 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_off0000bcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDD 10400 bytes
SHA-256: ca1b2277265bc9ac3fce24e87b4b00fc6404659b72aab98c87c4675669eecae7
font_01_sfnt_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 16140 bytes
SHA-256: fd68ec09454f71e659cc326a96578afae928c58a044dfefead64f6b4cf9885bf