Malicious PDF — malware analysis report

Static analysis result for SHA-256 4562260de2eda084…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 00:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 488e4db31080b9117b6c1bd7ca471be1 SHA-1: c9da37adf040362f4416c64a8842705b1b067bf3 SHA-256: 4562260de2eda0849fec35a9c6471b65e0b4f103e1af38d6350b49cf2c29f317
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and an ML classifier, containing embedded JavaScript. It exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF files, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the execution of malicious actions or the redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=chetan+bhagat+one+arranged+marriage+pdf+free+download PDF link annotation
    • http://go-pxl.com/uploads/files/tazasadodixusizexegit.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/28756684926.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/98224409369.pdfIn PDF document text
    • https://viceda.com/userfiles/file/64967010503.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f2e3e95f2666cc3623785d68f9a70eef/74974149170.pdfIn PDF document text
    • http://csp.hu/editor_up/17702583844.pdfIn PDF document text
    • http://dezis.ru/uploads/files/39343324341.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/26594346327.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/20387806015.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134435ee0ecc---11314925699.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/8943273802.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/8115318058.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/vixaw.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/83504304009.pdfIn PDF document text
    • http://unsersohn.com/images/file/23082374250.pdfIn PDF document text
    • https://timminsrenovations.ca/file/Bat5WNKyReBxMLCA.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/lotogozosopu.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/65566999697.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/retoxamisudibiwagu.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/zedaz.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gaxoguzosof.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/16293317150.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_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 11032 bytes
SHA-256: 5eaf570f46e753812d010041bbc1c9c70182533d3cac0f447917c3076c5abce3
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 18252 bytes
SHA-256: 363fc04330f843e515f2277e88060e71c268f57f4837ccb0434b56f361588b75
font_02_sfnt_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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