Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f406f84da9e7d5…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 09:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fcf3265c7347569c55b00d036e74da35 SHA-1: 1ff9e2f629e8dfadd975817e154bf31aa9a654b6 SHA-256: d0f406f84da9e7d5d6cf31bd61aebd95e762145607f0fee3db017ea24f1def78
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a strategy of using numerous disposable domains to host similar PDF files, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=download+words+with+friends+app PDF link annotation
    • https://gloriamus.org/Uploads/userfiles/files/96919750042.pdfIn PDF document text
    • https://denimder.org/resimler/files/25702740511.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/59639461448.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/silikifugulawifasiler.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/sibeg.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/komevuxewarut.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/86620136827.pdfIn PDF document text
    • http://chinalabware.es/d/files/xenuvozuva.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd2713c61---damivadugi.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210906191008516326.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/venemikesakatame.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140508a77117---vagidirapun.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/wuludaxivobimapejudew.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/mufimimurolukifoxu.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/5818234852.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/sogofiw.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kenebemixabopovazotijide.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/zarakik.pdfIn PDF document text
    • http://15881588.com/ckupload/files/wunuforamivizipidadunofik.pdfIn PDF document text
    • http://sakra.sk/storage/file/30352409818.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210903070002.pdfIn PDF document text
    • http://edeins.com/userfiles/file/gabulipagabosav.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/zuzefi.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/10048961597.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_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 10680 bytes
SHA-256: a9f3b19fda51012ece793cf1f55f140986dc79e1f1593447a5af74a5a6773b6b
font_01_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 18132 bytes
SHA-256: 4f16989ecee2dcbeb4fe056518c7962951bb3732fd32b38a0268df748d895ecb
font_02_sfnt_off00012bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1