Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a589ec89b9087df…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 13:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4aaabca8f09771767ae9f579970ee81 SHA-1: b97f05383d94715b04d9736636746993a93f55ea SHA-256: 2a589ec89b9087dfcd5c8dbebd426f58840b97c8bc161886b25eea78151268f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=k9+mail+windows PDF link annotation
    • http://neoneophytou.com/ckfinder/userfiles/files/nojudonafa.pdfIn PDF document text
    • https://termofriz.rs/files/8666178046.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/dasanelipejenela.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/ronubezef.pdfIn PDF document text
    • http://healthywithhart.com/res/file/teworuzepojudadiwozonev.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gupogovuzavafikuwoge.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210914094521.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/96017418440.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/88747520216.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/23816337583.pdfIn PDF document text
    • http://vodnik48.ru/content/file/24121249949.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/kisasiluloka.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148e513d2425---satumebimomijodexo.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/gasifasavufalobox.pdfIn PDF document text
    • https://mihalex.by/files/files/53212934212.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/4441598903.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/99188046984.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/86223032475.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/zetajusafibela.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/85345136360.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/973dc3584e50704a07685271eee0f901/17692955606.pdfIn PDF document text
    • https://thepainter.asia/upload/files/razenejob.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2edef3047---79771484276.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_off0000b2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EB 18216 bytes
SHA-256: 0fd542a96ed03ec999f5ff3bded4981f46e393851150a687145e8bf4b1a7e182
font_01_sfnt_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 10324 bytes
SHA-256: 471be1d23c94d21d7e55300ae70b4115e210c6bd68ac995acf89a1b4a796ca6b
font_02_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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