Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91466a54fd51690…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 11:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7087539b55b721a33afc1d5feafeb570 SHA-1: f2f3accb5988464af2e6a331c8b406521ea65180 SHA-256: d91466a54fd516908ebb70d71e1f0893bcf819958a9b19e4c86bde9e2d9fbd77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/uplcv?utm_term=bootloader+status+checker+apk PDF link annotation
    • http://theheavent.com/userfiles/files/87874464543.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/5843748953.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/80467390427.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/fuvomupavo.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/getapedoz.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/tawitafo.pdfIn PDF document text
    • http://dentherapia.hu/files/file/26173980452.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/51232874271.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/ladevijotofuwilaxu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613366d1b45e2---pamazaponelomujuxe.pdfIn PDF document text
    • https://istanajp2.com/contents/files/mirisusosugolawuwi.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/rokefatuwomatarinupi.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/tivujamilisufosolemuz.pdfIn PDF document text
    • http://gibisch.com/files/files/18488009339.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/xusuga.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/damoliruseboloxujok.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/53696891969.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614044f7197d5---30468419742.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/10918283373.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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 19384 bytes
SHA-256: 44e788b383a0442bdfd81d8eeb28bbfb41143c2eb24bdb3ac2891a1c29354a86
font_02_sfnt_off0001277e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 10660 bytes
SHA-256: ff1fa3a3798ed31a8add5ff8a0883f8c959bc38f765f568ff56677f1ee472900

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