Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbece859ee84b5f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-11 14:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 15dae8a58a67ec6277ec4b53d9428135 SHA-1: c56cc4492978b5685bb93f733ca0c320e28234fa SHA-256: 4cbece859ee84b5fb0e21ff44c35a89ca4d9d9f3579fe20d5a27afd06b2a2d2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one hosted on disposable infrastructure, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm on disposable hosting, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec717a47d---wudot.pdf In PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/36375169551.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210906091616.pdfIn PDF document text
    • https://phunhai.net/upload/files/42682066329.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/dusozelizidole.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/wegekebawifawidurolinisof.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/vonefoxitaduvodo.pdfIn PDF document text
    • http://robedecreateur.com/img/files/65888671864.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/71654550614.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133382eb15fa---tivubew.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/laburibujoxodisadawaze.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/muruleninetorelabi.pdfIn PDF document text
    • http://centronegozi.com/public/89216219892.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/34769177825.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/xatux.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/maxijipi.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/12816093404.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/guzazuxukodatateji.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/juzogoludigiwadopulebiz.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/novezi.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/kefefopabokusulixujimepi.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/33962642227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=videoder+4k+video+downloaderPDF 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_off0000cc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 18408 bytes
SHA-256: 95b2806940749faf22b9bbb53beb83c5e4e0c1451a51b546222c82dc5fecfe8d
font_02_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 10264 bytes
SHA-256: 2545c62f1cd8030f48194183656e407be701fc6b0d77a2552b9f3ac19aa8e501

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