Malicious PDF — malware analysis report

Static analysis result for SHA-256 59eb798db6d7c7f4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 02:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e63acbe80132039e79edd5a8ccdda0bc SHA-1: f78162789fa9ddbc32236c385467e38848c1a9dc SHA-256: 59eb798db6d7c7f42de391239576a68d7e2efb9c821c008a13ebaf0d5251bf24
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of embedded JS suggests it is designed to execute malicious code or redirect the user, likely to a phishing site or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dortmundpools.com/contents/files/fobapuzorisinu.pdf In PDF document text
    • https://ienter.bg/files/21274185713.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/44332665723.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/suburuworaweg.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/paguw.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/23915683428.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/firudaxobowefaputukakewet.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/japoxonomikijomozafefaj.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/87833304123.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/36266181761.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/dobopasedojamadeverik.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/zosufe.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210904141836425.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/goluzuwofebe.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/tovazewamemiron.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/20033448784.pdfIn PDF document text
    • http://medrea.ru/upload/files/xubuxolaxalabatomezes.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2668fd86---nomawedinakimapuwuva.pdfIn PDF document text
    • http://metallpress.info/files/38122662831.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///taxelulinifuk.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/32544029866.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109081936097242.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/wiwizibamemotepuxoten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+control+android+phone+from+pc+via+wifiPDF 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_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 16612 bytes
SHA-256: af043379e7a8e0a7beb597105255293e699ee3d228349fdaabd8b4cebc30bb72
font_01_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 10860 bytes
SHA-256: 43054f46cb5f7721cc52f7066ad30346083503819bd1f6c373b23b25d92979ea

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