Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37681240bdb6d0c…

MALICIOUS

PDF

75.2 KB Created: 2021-09-23 00:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd869781ba94a61b886700ba491e7128 SHA-1: d3e41a9e533261811e55758fb57da4614927a724 SHA-256: c37681240bdb6d0c931ae3cc3ea03e4a788b6ffc181fa336f65d84d17c3717ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these numerous links indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=system+webview+apk PDF link annotation
    • http://meble-tk.pl/userfiles/file/dumozazuruvuwikipujigajoz.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/sigovuvejavopugumow.pdfIn PDF document text
    • http://gaudi.tw/upload/files/miperekupavesubapux.pdfIn PDF document text
    • http://runhouchem.com/upload/files/86359559206.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/demugoroguzife.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9edad5222---xedigozudilafuw.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63062352710.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/23571081622.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/74482581069.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/neloj.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/tovemufonexesanobolisuv.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///1140280751.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/45550576495.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/92133295073.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/gomepaw.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/nosuweduzarozetot.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/tawebixanelan.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/47916357100.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210920/file/73968041099.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8b3dcda71afeae5c63177cda147ad920/telosukopanezezigex.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/vibopam.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/sawavi.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/64727209640.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_off0000c6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FB 10616 bytes
SHA-256: f45ab45b3dedfc9cb52522494d97af266dbd89fe464079572cd6984745f1a9d6
font_01_sfnt_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 15836 bytes
SHA-256: 3a634577d5a3b6ec68cce77f14042ac46fb79ae6dd13a94005ebb230650143cd

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