Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7d9ea45c5aabac…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 18:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0757e11c7ef2d30693b4106885f56a8 SHA-1: 132396c6c155fbadda76b93acd7d0ad4923512b1 SHA-256: 6d7d9ea45c5aabaccf7df6d865d3459c0ec9a1544deaa675b0b616e269b6a702
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cgl.lu/userfiles/files/vapagutipunufatezevuko.pdf
    • http://myshiou.com/uploads/files/202109042348232793.pdf
    • http://klenderbio.com/upload/files/39636724143.pdf
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/dulitivarus.pdf
    • http://phupmirpol.pl/userfiles/file/54916162104.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614142c87662c---nejufanu.pdf
    • http://villalapinetafavignana.it/userfiles/files/19775172713.pdf
    • http://uptindia.com/newsimages/file///burev.pdf
    • https://globalathena.com/ckfinder/userfiles/files/lobijefuwebepusebibatale.pdf
    • http://4seasonstours.in/userfiles/file/fenipeboxasadexufijixewu.pdf
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/85730805865.pdf
    • https://incense888.com/uploads/files/202109080743395774.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/94803187032.pdf
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/xofob.pdf
    • http://www.sport-konyv.hu/userfiles/file/finonewutenibupevomedejig.pdf
    • http://kssi.ir/public/userfiles/file/pixaliwopibebimomanosowe.pdf
    • https://galedo.cz/www/data/cms_files/files/nojinafinoxebiwubazis.pdf
    • https://ngusacdon.com/upload/files/sibibataduxufizu.pdf
    • http://www.farmaciapenil.es/userfiles/files/kepepageximin.pdf
    • http://rosesrealtyhomes.com/userfiles/files/wajidoxivozemikaresadadas.pdf
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/14468220965.pdf
    • http://ud2-140.com/files/3075430625.pdf
    • https://takipcisec.com/calisma2/files/uploads/misowokibo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=angry+birds+rio+hack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD85 16792 bytes
font_01_sfnt_off0000d59c.bin
297520e6a5dab9d5e9633a7f00930479867e671c22aba247bfbf443097532fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 10700 bytes
font_02_sfnt_off0000ede3.bin
13a8a0282160dafc6a229c71313f8fe05148a762acbbc494d01acc794e9a00fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 17692 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.