Malicious PDF — malware analysis report

Static analysis result for SHA-256 e593db0f24ebeae3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 00:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 072db964bb0dd17b4a3e18ab90efac12 SHA-1: 8e574b2f628eaf320c7a2012b21c08dd9e22d824 SHA-256: e593db0f24ebeae3834f8356ba8d7ba7349896bd4baea102af8b2e0e25b1423a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The PDF structure and embedded URIs suggest an attempt to exploit users through deceptive links, aligning with phishing and potential malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=how+do+you+lock+a+pdf+from+editing PDF link annotation
    • http://wellgroup.cz/UserFiles/File/sawat.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/30620901983.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/49327715749.pdfIn PDF document text
    • http://xycrusher.com/d/files/86262658462.pdfIn PDF document text
    • http://www.heksan.com.pl/file/62299508260.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/wivezipunar.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/9654084415.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/juvosekilisarusir.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/mopigafonatipupik.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/sakugu.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/sixujaguvajogufexubebosi.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/88770892517.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/wumeliwosupujob.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/98067354655.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/dea52734b3502569b1e925f9d441530c/zigugininoleko.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/futibolupafufibapano.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210904_9101A90199E370CB.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/61435868698.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/fanefatu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6a55fcadfa335b177a18241b368bcb83/69940120558.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/vonivasu.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/95479139339.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/wiluwakudesemopo.pdfIn PDF document text
    • http://namngonviet.com/user-/files/zazapipuzevedagewenulop.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/6439397813.pdfIn PDF document text
    • 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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 17648 bytes
SHA-256: ee301ea18825997441a2cebe0a876f088f6b44a0e6a54366be4c270a101b2fc7
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 11176 bytes
SHA-256: 86aef31dd715ef283320fcf295314d30535625c81f55adcd13b035b0384b6a82