Malicious PDF — malware analysis report

Static analysis result for SHA-256 556f80ff8e398864…

MALICIOUS

PDF

72.5 KB Created: 2021-09-13 13:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65b180874732454edd88c82b9c611e05 SHA-1: 67ebe28c240b14158a6b3dc0c788a2f12e64296f SHA-256: 556f80ff8e3988643aa1fb5f41466cb72b53e73f2bbdb4e220499ae3bbe74160
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains a large number of embedded links pointing to various domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=spider+man+edge+of+time+for+android PDF link annotation
    • https://fotojursa.cz/userfiles/file/75690119298.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137453036d01---51890384190.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/votonu.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/40811566391.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/92908616864.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/1832267131.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/sabelatozovizusuwamokobu.pdfIn PDF document text
    • http://penetrat.ru/files/files/votag.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/93531662247.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/sevijanezilapiwaz.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/vuviduziri.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/gamuzomegub.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/13657270599.pdfIn PDF document text
    • http://surausa.com/uploads/files/10450227317.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/20027446199.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/85225780466.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210912_DA66CB802F8FCC79.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/jogibipajukopewizijojixix.pdfIn PDF document text
    • https://harmony.im/userfiles/file/84156471414.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/63535403674.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/maralitevutoji.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/nelevijalilarekaxemewidi.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_off0000b896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB896 10700 bytes
SHA-256: 2df30248755626d0ade671537324e5c1dff2ea5fea1e7ca80a098f6caa0d4aa2
font_01_sfnt_off0000d0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E4 16584 bytes
SHA-256: 24b722e4a5f009ca978a89fda92d4a8a8eea88d29f38ae4791f19b22118448bb
font_02_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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