Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2b6a2b2b31920e…

MALICIOUS

PDF

68.1 KB Created: 2021-09-24 19:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecafb6af61acb4eaa2374427fca4732b SHA-1: a3cce717b83ddace31ed587f87093577d793e9ab SHA-256: 5f2b6a2b2b31920e457b5b4d329a553755c281bb708ce07dcbd8db349c992c01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The presence of embedded URLs and the PDF structure indicate it's designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://wjcopy.com/upload/files/wisip.pdf In PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/68581727215.pdfIn PDF document text
    • http://agrion.org/upload/fichier/81068951725.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/pujadomakovirefesunemolu.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/vunusalavinijogigi.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/mapoditolife.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469b5f1683a---zegamodevukerategebosa.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/25749129003.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/55304006828.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/sirepirovurulagelewilo.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/vavubaxetigovibide.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb4d39b59---56426267738.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/rorisojus.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/39890857073.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614455bdba003---gomeki.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/23243047965.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/mevunegowororosijafipi.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/46613377733.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/27566118969.pdfIn PDF document text
    • http://www.agot.pl/upload/file/fuwanojoziwavofeda.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/20858081708.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/74885643235.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/90990728544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kingdoms+%26+lords+offline+apkPDF 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_off0000ae7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7D 10036 bytes
SHA-256: 0d5050725b9f88d4d34b638565f049b525c63c4bf54f60da291699ca50037608
font_01_sfnt_off0000c460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC460 15492 bytes
SHA-256: 15e39d70b089f2cac6985479d3e91d3fcc29941402e2b6619165ec1972c75bac
font_02_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1