Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c82e43ce4294dd7…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 03:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e7f800b2f0db3c9f2d157b6f7a9cd70 SHA-1: 3437c732a3210205d27237a1ee0beeb5b7fd74fa SHA-256: 8c82e43ce4294dd70d0f5237c2ca5c9b750d5627c6e45aa9ca7d4db379894092
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings like PDF_SEO_DISPOSABLE_LINK_FARM point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jogagongu.pl/userfiles/file/nobovisowi.pdf In PDF document text
    • http://medwin.kr/userData/board/file/4614515479.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/43856178534.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210917181521.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/75296055761.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/42739238201.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/leduw.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/78794160498.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/wukomu.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/pupezatuwosowo.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/33920160080.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/sedojegarepid.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/vunegawibitis.pdfIn PDF document text
    • http://labradory.pl/file/79046874724.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/87679296335.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143a8262b57a---masogizokosanelabigun.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/90124189456.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22de5533d---nokunoxi.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/15955282615.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/3863266747.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/jefazofeku.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/19478696941.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/56766127371.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/27507748411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=iptv+apk+modPDF 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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 10020 bytes
SHA-256: ea2cbf237b58a05e1be0a14af550eee72c383870670a16f65a0e1ba20d40c4d2
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 17432 bytes
SHA-256: f4648291233b6a2669583ff70675e2b5f28756d4c5059988fe19c731d9deaa43
font_02_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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