Malicious PDF — malware analysis report

Static analysis result for SHA-256 c951d9fa662f2b82…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 10:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26ab4e5fc7fce7860bf80c8740bb31f4 SHA-1: f3eaa07b5bed1a1aac4c613726433203fdee84a8 SHA-256: c951d9fa662f2b8248c2d67e020909f302d2881967bcd16db418ef639cab65e9
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 pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://telecycling.org/files/file/73735903782.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138387e9605e---11466399930.pdfIn PDF document text
    • http://balone.net/_upload/file///72586094605.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/gejalazujo.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/50671402671.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/80161023900.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/baditugofudavuresipikiba.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cf9987c82---bedixijavibawigopafuser.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109061002351375.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/fotowimanilevarumaperafe.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/jawafipafoduvo.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/donej.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/movofezonuxisosepa.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/1407501266.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/gegaw.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/91474224590.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/nuvufe.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/87160320597.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/78636731211.pdfIn PDF document text
    • http://hasyo.net/files/file/2180634623.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/sotexonipujapukujunerefo.pdfIn PDF document text
    • http://boki.hu/editor_up/82485011498.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/14/18583419338.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/38545770048.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/7322596863.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/mabuxomewadamif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+find+hidden+app+on+phonePDF 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_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 17220 bytes
SHA-256: e8c13b807f50c662ed748fe016c4acbc18cbb8f49d2f8c7a8e56adecd76e2ff6
font_01_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 10360 bytes
SHA-256: 8fd4e42891ce2a4144f970b1a52aea83e74156aeb2b150a2fb4400717dd57063
font_02_sfnt_off0001207a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1