Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d319cb5ff7b98f2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 11:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f1dc30f1a28fafdaff8a0df4fc3a587 SHA-1: d7a93c23b2a2033139f39165f57b06841ee5913d SHA-256: 5d319cb5ff7b98f209080b047a7abff459032aad37765419087b2168b12aea5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the PDF's primary purpose is to redirect users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://capri.lt/userfiles/files/dokedizibol.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3492d0ed8---16864674035.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/tatolofebesagajefekavu.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/34387307700.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/4233031812.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/nobazidozuzofuzejadiwe.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/20163474567.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/vavurojofimulawonibabalu.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/87864001711.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/dukak.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/risuwevoxosomuxufesori.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/wezudi.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/17804333308.pdfIn PDF document text
    • http://stroi-sistema.ru/img/tigalazoroxelinorekuruweg.pdfIn PDF document text
    • http://synphabase.ch/upload/file/8374826407.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/gesapetoruliwi.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/makepoxipufoxake.pdfIn PDF document text
    • http://perksys.com/userfiles/file/56151750579.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/36253748425.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/pitawoguzitipebuseloxone.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/ruxaxojuduvakolese.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/xajodo.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/4882390695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+add+language+to+androidPDF link annotation
    • 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_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 19304 bytes
SHA-256: dfbf9e77e8bb0a172e821752a664acea1c8bf299ab3d8bf6a0e39f250019121e
font_01_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 10432 bytes
SHA-256: 85810b39337957312cb30e2fa0115beb6ebf70aed944df273177c6450b7b5e00