Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f6437203e8714a…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 02:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9ba003f824d36abae481784c0debf33 SHA-1: 8f78f03d08b5f5fb84f703e8e8810cfb6f508d87 SHA-256: 77f6437203e8714abbba398043fbd566fb12c22c0744c3bbc544da1a9f01d5af
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to PDF files hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.herbertvanderbrugghen.nl/draft/50362995915.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6fa6731e---32718274198.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/bosew.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/54269839808.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/15524458780.pdfIn PDF document text
    • http://nature-revive.org/files/file/voxitavorupadela.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/tuzevasanekitabobemodi.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210906151503.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/tujaz.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/vomomebopib.pdfIn PDF document text
    • http://benly-carson.com/product/files/53706420605.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/38883205681.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/45029961938.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/29339033740.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/bamoliwotor.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/rubegiwidowiladedovizevu.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/pemavonetexunibebise.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81b5e1463---94986815120.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/fexifakurakoza.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/mezetumer.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/23653663656.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/19537276167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+film+attack+on+titan+season+1PDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/38448897781.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_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10089 10768 bytes
SHA-256: cfab6ebc205f7ed23c07bafdef15620dd6ae795a30bd5f3069d20575f1fe9e90
font_02_sfnt_off00011967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11967 19820 bytes
SHA-256: 03deb75bea1ff3f45dde310fa9a808eb6d1cea259e30d4c2c95dd3d06f3324ca

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