Malicious PDF — malware analysis report

Static analysis result for SHA-256 da10d93e9f0e629b…

MALICIOUS

PDF

68.5 KB Created: 2021-09-30 12:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47a25b240f36ce1948448d390ba2348a SHA-1: 39788e1541cde2be07395baa78296c3209fa06aa SHA-256: da10d93e9f0e629b925790bba2621e400437e7ab1338e41c83771e3c85d35530
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smartpaintingplus.com/userfiles/files/41690994745.pdf In PDF document text
    • http://studiocastigli.eu/userfiles/files/bowiwosomatop.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/giwiv.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/72951207141.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/3148286329.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/zezomebodupodunokar.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/nobarewelusoxegatob.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/xixidemowiliza.pdfIn PDF document text
    • http://0955205219.jwa.tw/userfiles/files/xovil.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/ladawuguvitipegakopezonod.pdfIn PDF document text
    • https://whitesal.com/data/images/file/6930_20210924181945.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/93649456249.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/zepipemeroku.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/tuvatunelotekusetuguwiz.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/72059340720.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/lanigadiluni.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143399a3774c---gikunokorovididuwewul.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/62232818564.pdfIn PDF document text
    • http://vucert.vn/uploads/files/49540586163.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/xupozi.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/judanudeg.pdfIn PDF document text
    • https://shreeaksharinternational.com/webroot/img/userfiles/files/59750954699.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/fuwikunufiv.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/57429418586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=critical+strike+online+fpsPDF 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_off0000ae89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE89 10596 bytes
SHA-256: edd9be608652e5f0a36a5c022f8d9f71c859da7bbd65d5eafae3cf7d00ea4150
font_01_sfnt_off0000c6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 15132 bytes
SHA-256: ecc24a21e029dbdb079cf60ea6db1e52934485903e3dbc889137b0d9338e8cab