Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da5def231f20a3c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-10 16:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77b26935666884c0f9827d554a4b0819 SHA-1: acfe0e2638b8b2f3427e6aa3ba3f138a13c7509b SHA-256: 8da5def231f20a3cc5cc538eb44f572b6b9bdc8ea40321f2fcd7dba4b60b2a54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs that function as a link farm, directing users to download files from various domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm structure strongly suggest an attempt to trick users into downloading unwanted or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://viviapalermo.com/userfiles/files/25511602749.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137079c16306---77196209116.pdfIn PDF document text
    • https://ocw.tw/uploads/files/reneboxogonisarawarivi.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/gojaxafusirifozalepamakev.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/58546834132.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/98262753369.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/60060863572.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/jobazolosodamo.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/jijafubilatupalerisefes.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/39230329685.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/fopumigotiporuzegedomek.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/61297964590.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/vavudolapezewi.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/90917422096.pdfIn PDF document text
    • http://edituj.cz/res/file/95712106592.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/70014003623.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16312656551195.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/pazofaxigunomaruronepiso.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/buwegemojivep.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/bibafadalimujulewazoge.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/88772303898.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/filofivotafovepib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vidmate+download+apk+originalPDF 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_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 10712 bytes
SHA-256: 7537b504d171b9e1616917adb5808e4f176f9f1795598b16588e68bdfd39f6f5
font_02_sfnt_off00012656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12656 17192 bytes
SHA-256: 2d8eed846bcb2187e1286f485afd04a6d52bc700033312b0ce13e9cb3f4e8679

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