Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b819a9a42d0b19d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 05:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee29e2bcb961940f7bfdeb294a3a0cbb SHA-1: 3897efef380e051251f75bd18ee3b91d75d1e00c SHA-256: 1b819a9a42d0b19d622c9dc965d90a00c0e85726c1c5d33fc65de7e6a9c1bd95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure and URL analysis are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=free+music+apk+2020 PDF link annotation
    • http://dailythang.com/userfiles/files/rikorozezativ.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210915/file/16317106991343.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/vatiwufol.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/juzena.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/74976100633.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/28275672032.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/69901096068.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/lefisidukijifiris.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/27891682045.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/66029379047.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76c9af00c---pewunopamurazopu.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/86813794589.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/zawususakokutidiru.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/tinakizora.pdfIn PDF document text
    • http://tid.vn/upload/files/zuwosumujanaka.pdfIn PDF document text
    • http://jsdarvin.com/files/dabemovijafot.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/matomovodesetipavem.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/31730819557.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/setusemimubepireli.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/49521028930.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/32568646837.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/kivejawovufeb.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf90254a5d---9349924989.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/42732929846.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/pafatedo.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_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 10576 bytes
SHA-256: 897361ceda883bb2c6b8e9af21270cd31bc159d3a2fa00ae8679319927118921
font_02_sfnt_off00011931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 19060 bytes
SHA-256: e64ff012d38d633cfa61b50d0c225a950b431ec89cd235aa0eaac6a711c0ccf3