Malicious PDF — malware analysis report

Static analysis result for SHA-256 4841b7a9877cb910…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 18:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd0bbb456bcd5d95d9c724cb86f05390 SHA-1: 5ac912f8006c4263140c0de36b46aae08ebef3cf SHA-256: 4841b7a9877cb9100c92c13e05634c1989612de9bc6c4cae75306c186ce95f3c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://anaksemut.com/contents/files/22719908502.pdf In PDF document text
    • http://ptaki.info/imgekoprojekty/files/54884199947.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/8722785313.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/sotejijoxelebu.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/jinalesusinenepupigo.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613736683aed9---jonurixobatof.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/92520139898.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/jidesebep.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vezexemalafidojasufizupok.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/nesew.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/gavedasovekirilak.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/81383330726.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0c2drb76v1i28qfqghpk63pce6/vajoxowerikuwi.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/79600954129.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/81975473786.pdfIn PDF document text
    • https://best-label.com/upload/files/lunudoverikus.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/80923382826.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/12393555036.pdfIn PDF document text
    • http://hueide.com/upload/files/11711700815.pdfIn PDF document text
    • http://alltechsro.cz/files/96441534331.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/goxegapepexifej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dragon+city+with+cheat+apkPDF 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_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 10732 bytes
SHA-256: ae597285dbe397d4e82d035dd80fa181ad9dffd8c2ffc7f0f03b679c4701a398
font_02_sfnt_off00010210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 17384 bytes
SHA-256: 8af2ca0c3634219e545d87b8bdced04ccdd8dfd7ed72ac166e63523979ccf6bc

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