Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58d5cc0d120b98b…

MALICIOUS

PDF

81.9 KB Created: 2021-10-10 13:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a24b099c24d5c55058faa4a2d478f3dc SHA-1: a1b839ea150c84e81b687f986de2d3708e6b21e8 SHA-256: d58d5cc0d120b98bfa5989a6e3c9f3f38bc25e6082fefcd18a19e6463efdcf79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are associated with link farms and disposable hosting, indicating a strong intent to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to facilitate phishing attacks or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=isao+tomita+the+girl+with+the+flaxen+hair PDF link annotation
    • https://chennothinterios.com/uploads/file/32126692010.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a6a2654ac73d948ef77d58d5322dce23/1965307813.pdfIn PDF document text
    • https://salwangurugram.com/files/dejesenufeg.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/rosapux.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/28620679733.pdfIn PDF document text
    • https://31app.com/userfiles/file/vuwuj.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/lowowofut.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/78617112331.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/25304159619.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/duvasofemibedoroximenela.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/73019548623.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/vixusexofamatoxuko.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/35857611928.pdfIn PDF document text
    • http://mamam.by/upload/File/file/44130834727.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/85336278661.pdfIn PDF document text
    • http://ipllaser.in/uploads/mupemubelezun.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/57371309613.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/1482907832.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/veletanivokugojotodo.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/lipufowogixegavekomo.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/tuvodowevesosemulo.pdfIn PDF document text
    • http://voyagerav.com/v15/Upload/file/2021922225655346.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/dafokopekurutepakazis.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/22345128406.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_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 10800 bytes
SHA-256: 0d8aae541da1cb8860c157c6272d38858ff0a658523f649a7b42ff4c0a5567b8
font_01_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E1 18676 bytes
SHA-256: f60f72f906f0b68979df110099b00c9bccb469396109963deaa016ba9a5726da