Malicious PDF — malware analysis report

Static analysis result for SHA-256 d226900ad8d98e4a…

MALICIOUS

PDF

96.3 KB Created: 2021-09-18 13:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5ef5cacf9a351baf628fd77b87b7c02a SHA-1: 26f99ea79d8ef72119ef9d96d44807f14451be08 SHA-256: d226900ad8d98e4a8f9258aaf4e8962c6758d3b29f6a879e464750e57ff33f9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9bdcee06---81560830866.pdf In PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/29629924348.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/77375906202.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/2285253155.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/zokitigejutanod.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/52954145812.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/vaxazo.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/peguletatonikowikijud.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/87393566344.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/88176783367.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210909032130.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/82192165952.pdfIn PDF document text
    • https://webmenuplus.com/images/file/25988325272.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/r9v2mb5t3r9a4lifirhrspg0ai/vosuz.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/38404678997.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/kejowesuvaw.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/85716410683.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/86797167727.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/vifinokizaram.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/53395081516.pdfIn PDF document text
    • https://negaratoto.com/contents/files/kizan.pdfIn PDF document text
    • http://zamgph.com/uploads/file/030751518092.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/41835742888.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/18444384189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=apk+skin+editor+for+minecraftPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 16380 bytes
SHA-256: 6154b12a9e2cc94f816cb8653bf1943d22d5e3e4ef8c393a99ab04774184dae0
font_01_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_03_sfnt_off00011bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 24412 bytes
SHA-256: 13f7fe19e7ff958ea0939d3b515a2ed984fc4343ff0f51b5c3d62bd93829e567
font_04_sfnt_off000159e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E5 10808 bytes
SHA-256: ec4d7d538c2d4c988e51f708fca80a05af98d80f9c7c32184f85f5e6a45bcfe7