Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc9fe5cf1f7da68…

MALICIOUS

PDF

71.2 KB Created: 2021-10-02 09:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3da415eccdf6fa97bbc0077e5bbe785e SHA-1: 76abdea488b5259929369608584f7e8802b86fee SHA-256: ebc9fe5cf1f7da682858fbb4168eb695438edc98df316f3a3b511849060bc7a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=how+to+convert+pdf+to+powerpoint+using+adobe+reader PDF link annotation
    • http://oembag.com/uploads/files/202109031810446729.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161483059e6d1b---sitasoniburizoxifat.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/tenoxanuvobadedukigud.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/puwakitepagorekafapo.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/povugidevuj.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/98256369431.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/71637192473.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/zavilupalibolipo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161579dc52dd2c---felumekipixad.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/815507182.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/dozewagel.pdfIn PDF document text
    • https://ntc-container.com/upload/files/xozolibez.pdfIn PDF document text
    • http://polishedskincare.com/minaret/uploads/file/13033873365.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/45562471775.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/52811256327.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35de39931---7383694553.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/49763651151.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/posokozozezoga.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/58793080052.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/kesiwegofuwozufabujuji.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/suxexupevugosini.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/85109264240.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/vijopodujizufukimalokoxun.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/96260624215.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/sawajemekogotuwakuzi.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_off0000b39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB3 11132 bytes
SHA-256: 683b7a421fd643c4714f9266337f9e9b9cb114d410876ca5269b4f23550e3063
font_02_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 16216 bytes
SHA-256: 35a9e9452892ee39fbf1eaf6711d35b6db5f1c86a74dc062131bac8447bea6b8