Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9fcb75af65fa4c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 20:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed5c861f3befc86bbe2146df00124950 SHA-1: 45e3bdb00ed2b9895427370d0aa188f40405edc2 SHA-256: de9fcb75af65fa4ccaf0aa451506813f7e3337dcda12f80b39b2322869cf3b59
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, and multiple unknown URLs were extracted, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cableesmaltado.com/d/files/4946973652.pdf In PDF document text
    • http://www.polni.si/Images/files/49085102278.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/48594625242.pdfIn PDF document text
    • https://remini.hu/userfiles/file/64547102315.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/lexejugepesiwim.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/491281637.pdfIn PDF document text
    • https://dukupahit.com/contents/files/35203722920.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/morev.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/biras.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/mavudamivubekadeden.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/retusurukopuri.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/14999090498.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/fomedebaxogipemamavexuw.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/muwajakalijedevexojofuva.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/zonojufajunijekigixojer.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a6818820---rowasuzesamabituvewu.pdfIn PDF document text
    • https://arendic.cl/files/2217728155.pdfIn PDF document text
    • https://questyme.com/userfiles/file/semipivukulupa.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/guvaka.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/92316316394.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210916_AD8159CBFCED0A86.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/suromoditatogi.pdfIn PDF document text
    • https://people11people.gr/uploads/File/82111833658.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/18812482411.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/fasufefebopujabubonup.pdfIn PDF document text
    • http://compsult.net/userfiles/file/memanupewomoxaxoxew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gruber+public+finance+pdfPDF 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_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 10504 bytes
SHA-256: d9bba5bed55168518e5ff1430203a5eddcfdf8e13a5abb6a504cdb91b088f38c
font_02_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 17460 bytes
SHA-256: 96c19b88009a73f7a0d7eae028397c361967c66101012a00f1d8e4b3712f6d6a