Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15bd31cc7045f48…

MALICIOUS

PDF

145.4 KB Created: 2021-10-14 05:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 31de37df7e5c444b406c51ea658c0d88 SHA-1: 755098cc513ff73b1b907c76a03718246314776a SHA-256: e15bd31cc7045f48e6dee5014a9234307842c6adcde8dcf6f827b96b53fdf376
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://pistant.ru/uplcv?utm_term=bailey+cave+fireproof PDF link annotation
    • http://birdwatching.sk/media/file/pagidubujosepodu.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/paseze.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/88878432076.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/bupirujulidodefizujim.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210911_FCF78F5074DE9C27.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/gebutejepupax.pdfIn PDF document text
    • https://botroul.be/uploads/36875477961.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/dejitewefez.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/1670708087.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/86327210963.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/pilobavilov.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/binebibukikabodebigew.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/1675143903.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/84668833046.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/82771391569.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210920_E51FE20AF7E60784.pdfIn PDF document text
    • https://atiksigorta.com/files/65508325757.pdfIn PDF document text
    • http://maidichike.com/upload/files/58498645138.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/85570255878.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614edbba3538f---13780276132.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161617d13c3222---93677306329.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/jufupivibufofajufisaji.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/xejug.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021101105475012.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/beganolasozalipitevasa.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/vonapexunogez.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_off0001d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D269 21180 bytes
SHA-256: 5f6d9cbb283f37d45d69f897da1eec58125e5095948c01d16793e9d2b8d90398
font_01_sfnt_off00020930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22147 10336 bytes
SHA-256: e6a5ffbf916e718065e8995748ee8e427c6f73e6cd8dedd3e058559d4271e827