Malicious PDF — malware analysis report

Static analysis result for SHA-256 77abf26baa20835b…

MALICIOUS

PDF

70.8 KB Created: 2021-09-16 10:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 877913ae7388731a5106cc6347e1d137 SHA-1: add2fccdf46429e823b622b3f3ba778bf8324476 SHA-256: 77abf26baa20835bb852e0ae65a1098e4bfc51ae5334a45b8b093cf39377c2df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external PDF links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a potential attempt to distribute malicious content or phish users by hosting many PDFs on disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://anhhieu.vn/hinhanh/file/somubizuvutegavawefit.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5d713c6e---79657570392.pdfIn PDF document text
    • http://panteres.com/files/files/47400525312.pdfIn PDF document text
    • http://horvathortho.hu/tmp/91082802945.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/78930905014.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/14715487965.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/xomotodejudidijada.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/gofukebixejoxogop.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/zejizokojovozofi.pdfIn PDF document text
    • http://inica.org/files/file///7245115415.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/sovosemogesidukevufu.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/loduxo.pdfIn PDF document text
    • http://kunbot.com/upload/files/88504965801.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/folusawukoz.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/13851258030.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/11708629337.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/47242897166.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/77882641938.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161366b18978fb---mulexodosubatowixuxik.pdfIn PDF document text
    • http://full814.com/upload/files/1916314613.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/pisenepizitub.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/xilapimupasorovet.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/seresomiwaduzugevuwiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+book+of+forbidden+knowledge+pdf+free+downloadPDF 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_off0000b265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 10792 bytes
SHA-256: fc1ac81cb3c3d47a3d6ecbdcf3b88a5dc6746831b5370a303afa9d6df9e7691a
font_02_sfnt_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 16976 bytes
SHA-256: 6ed7d3e38e5f1526ad4019ba032d736b96c48dd89ea6c6d6226a2cb36c2f25ab

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