Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3ad2858b486ac4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 04:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b74b2459d4f70b19ad449bb567c6be4 SHA-1: 132c7a8bb6aec23d25a1a9c428944f84ac8fc9b6 SHA-256: 7d3ad2858b486ac4e7e1a9274e2b2b31e2c2aa68b97d315b18bdc04a1e8616a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are configured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of external URIs and the 'link farm' heuristic suggest the primary goal is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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 https://medvor.ru/uplcv?utm_term=play+hill+climb+racing+online+on+pc PDF link annotation
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/66281515378.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///nepiwipo.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/44446888821.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210907090214.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/mopariva.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/duralaxosufibukarufubex.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/zeduxexugiwovaxivanefo.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/zopekoraxifiginebukonu.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/gekomigakijusonuvoji.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/10684611983.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/61372e18447e7.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/pazumolebefam.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090719355068.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/niribexevejatilepodanomu.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/mumewerogumolib.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/xiwegulalikovifo.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/tigarudolaresot.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/muwuzoj.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/medisisetosagekajebonivo.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/63848248526.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/dedubepikojosakogovorefe.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/vilasojodenasekosokeje.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613221f624916---50159151587.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/sutegexadukobusog.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/bomegipinafawazumob.pdfIn PDF document text
    • http://ping-property.com/user_img/files/wirixubeleli.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_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 17636 bytes
SHA-256: a7011bd254c2e1fec234492cf86f057529a0af4037e7ff7263e674b0be6206bd
font_02_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 10808 bytes
SHA-256: f556a529969c37917a5f783f9b8f94de259cb5e43c84b8635aba2015726397d4