Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bff7e0edeafcca…

MALICIOUS

PDF

80.0 KB Created: 2021-09-26 16:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f86d6bd3602f06ff02e1333e7f2216a SHA-1: fe849c4f45005b8c8245b425f109910dd29f5593 SHA-256: 86bff7e0edeafcca229e2ee30644b17af4d49670f7aed21d36b0ff3cbe7924a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of many embedded URLs points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://edins.net/userData/ebizro_board/file/41287618032.pdf In PDF document text
    • http://immobilieninvestors.de/userfiles/file/sejuzanuzu.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/61070863567.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/98689394571.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/sorok.pdfIn PDF document text
    • http://soles2walk.com/data/file/17041972367.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/96371970180.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/46448812548.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/90620642165.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/52978002948.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/42555321937.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/tisasegewijifivizepobuti.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/bedenogufinaruru.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210904053438.pdfIn PDF document text
    • http://abwessex.com/uploads/files/tisazivatemad.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/detekijerakejedaxuwaxuvu.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/nefojetujoxokepupuvobo.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/33340301116.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/laxalirovitoxug.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/32511769418.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/fevafo.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614df4cf5a063---36869731286.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/7260469449.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140789b52db5---rodakotivoxiwutoxatuzagok.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/borosaj.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/sabejonebobimogubu.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/konudegasoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=5e+periapt+of+wound+closurePDF 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_off0000ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 20988 bytes
SHA-256: f94394c37c84965b984453fbe0be32d678a8f08599b00f1d78512578a6bc5c06
font_02_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 10836 bytes
SHA-256: 95d447ddd4e546c3a950cade0a99201486cb2ac14f82e1867ea47b845abeac77