Malicious PDF — malware analysis report

Static analysis result for SHA-256 a992e672fb727c6a…

MALICIOUS

PDF

86.6 KB Created: 2021-09-23 07:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f3b122bda809775e85e984c48897c18a SHA-1: 09dfcbd074d6009f1fc684b8aad8bf5a7d0b26eb SHA-256: a992e672fb727c6a36f721908d6f9a5161810853981fc56441e6901bdc98d302
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.nissan-utilitaires-melun.fr/ckfinder/userfiles/files/furasipezemixuzex.pdf In PDF document text
    • https://alnahamgroup.com/userfiles/file/wulugokijeginiz.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/lejefimen.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/jiradorabol.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142d8159a39a---86217632864.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210911202500.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/3015141947.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/89240189945.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/14889110309.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7e31e63ca25fa83ef8b042f2f45b8f14/tumagekebidixukogex.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/51042218876.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/93609336244.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/gotabawabigosixokagoxid.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gifutet.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/logodonokuxezonetaketo.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/rofudifofejupadebo.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/sadavibawom.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/xekutelediwutewejijoxop.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/2566154517.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pogerojeleralofatabode.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/rifolevunenerawepixawor.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/wogekexoku.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/67815486242.pdfIn PDF document text
    • http://zuszdounky.cz/files/zebaxoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=apps+that+lucky+patcher+can+hackPDF 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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 18904 bytes
SHA-256: 34e8c41bf65dcc63d0930c1c73d789b1eb594269a771274261070b793e7d887c
font_01_sfnt_off00011c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001347f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347F 10548 bytes
SHA-256: 985a0d9d29f1982623294ed0abcb9f22c867143920f4937d5847187143c02c90