Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7a45fa1cf5d0ca…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 00:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c01c9a692d865e9e40475f8bc8027db0 SHA-1: 5d3f67e824df3ae93a43d2da2056f7a0b6bfae62 SHA-256: 9e7a45fa1cf5d0ca6b66e4cf18f5324e46e03899bf3c956ae60b7a554cf79d6c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many of which point to potentially malicious or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

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 http://www.santabriganti.org/admin/ckfinder/userfiles/files/23791379344.pdf In PDF document text
    • http://tubietelbar.hu/uploadfile/72305856631.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109141518039186.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143b3496ae15---58515277472.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/nuvufifukufaforifo.pdfIn PDF document text
    • http://samtekelektrik.com/files/830223170.pdfIn PDF document text
    • http://videlec.be/ressource/file/90876010778.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/25689330708.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/96936054795.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/femipogopu.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/74828947975.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/wasuwusukibuvewuzaxawepi.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/48041968347.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/jeloxafoletenusojoziduta.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/87497767365.pdfIn PDF document text
    • http://davcpundri.com/css/file/kidexe.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/1372932898.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/77382347564.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cede511013---54064956277.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/47215110149.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/21615426083.pdfIn PDF document text
    • http://podarox.ru/public/files/bovute.pdfIn PDF document text
    • https://forums.androidcentrIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=other+files+in+storage+androidPDF 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_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 10660 bytes
SHA-256: c8415158b64be8a81ca96bbe6591b13c29fb37805c8b561dbea5296b2ed8e615
font_01_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 18516 bytes
SHA-256: 050d8e2b5619a7ee5b10ac4c6f6a2eaf1e586593a9478d5f763cc33e0ea2be15
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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