Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f117c530a1390de…

MALICIOUS

PDF

103.7 KB Created: 2021-09-19 19:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de1c18707fa0c9a9a6d181e6ca88ae2a SHA-1: 99b9431ff823ea1862053a313abba5834d60aa03 SHA-256: 4f117c530a1390dea584c1dce4d2a229e4347bec22a3fdd674df91640d3d78c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://pixomot.ru/uplcv?utm_term=the+square+root+of+144 PDF link annotation
    • http://olguanaokulu.com/upload/file/dakutopamubuzuwetitarop.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/tididuluwija.pdfIn PDF document text
    • http://flirdining.com/uploads/files/57944777699.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/rovedotivegupeze.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/rivozekotodeveb.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/natidapivumavewokobiwurob.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/48970090361.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/nobidesiwepozifelexuzaxu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b142aeea51b26e35da6e835b0275cea4/23624308722.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/11399073500.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/71980624541.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/zibugafekokezilomu.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/direxoxeruxukexitikeduker.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/pinemokajozefoj.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/56875167871.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/66673460982.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/30802441812.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161324c9e8f0e1---nazavesoxukenokusova.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/jewewilinadubamubawovis.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/lexixudonukugupabof.pdfIn PDF document text
    • http://kaies.net/upfiles/file/zolesixipovenudi.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/wuvemalolum.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/wipusalotuf.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/xumotujekanijigikijux.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/pawepuniza.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/duzudupabokuzogafuk.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_off00012cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD4 20076 bytes
SHA-256: 13ecf5f7fd93d04e60863bccb038200b025fd53d33c624853a9d8c611517c7dc
font_01_sfnt_off000160f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001790e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1790E 10408 bytes
SHA-256: 3610c7bb8f9ba24976fbdfebb4f40af2ab93cde1ff09cc8e8b368256bb518b49