Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93fbd4165560df5…

MALICIOUS

PDF

89.6 KB Created: 2021-09-17 03:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b871f0dcc30a2065dc6c41e0c407de41 SHA-1: 189e6334d11f31fc4ea230457417f896be9ed709 SHA-256: e93fbd4165560df5d7c2a2cb5e15f64ed3b122360b3139b2130297323672dc55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous URLs are embedded within the document, likely directing users to phishing sites or further malware downloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to obscure the malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://chatyzvule.cz/uploads/73307164419.pdf In PDF document text
    • http://skmsm.com/userData/board/file/17328972033.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/40051343650.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/cbb4d0f7e1187b91d7a8b6a2e10372bd.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/zibigamosabogipiko.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/53324075080.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/gokibonokoxewi.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/wedosojezedul.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/pexuxuzaperujolosaxaf.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/zavexoguwomurowidofun.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/96078671634.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/78839224802.pdfIn PDF document text
    • https://longhungphat.org/Images_upload/files/58781996670.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/dofigutubogulomupigazotux.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/loripufugikimabasupori.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/wajorikajapubel.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/povirekilumujutena.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/91855976172.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161314595dfc30---22533831447.pdfIn PDF document text
    • http://cataga.de/beta/files/file/8526976882.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/vitesamukasiramuduvem.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/vekuto.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140a4bbb7471---fegesisokowubapefo.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/sizeda.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/kawuzobagibenururesadima.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/93014510226.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/57935610230.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/sinibufemazolitojufun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ip+man+2+full+movie+in+englishPDF 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_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 10844 bytes
SHA-256: 97a9f0f0411d1e79afd3b3d7dcaee69506ca96d69bc654262c6b5b9c8bfd6414
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 20336 bytes
SHA-256: 69c85799ea0f313ed12ced8482a821ed25581d12ecfff2cb6b3d82de901522af
font_02_sfnt_off000140ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1