Malicious PDF — malware analysis report

Static analysis result for SHA-256 225e92c510eaef30…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 19:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29881fc398a85c282ad7253b2a4e3b70 SHA-1: b5a2f58241736b66d0b1b0599c75890e0d0537fb SHA-256: 225e92c510eaef30b9bc8b327ce4b7f03f37bad58bfd3a3992ebd9d50c5d77e4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=how+to+get+diamonds+in+clash+royale PDF link annotation
    • http://bsp-oblspl.org/ckfinder/userfiles/files/45031148434.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/kamuzizuzosasadiw.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/70225995749.pdfIn PDF document text
    • https://grnca.org/img/files/files/motumalodosajiremo.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/88823215516.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/12500103047.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/3360760262.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/mogigorokugif.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/77679100828.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/85058655460.pdfIn PDF document text
    • http://nova-auto.com/upload/3381707583.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/zemajomajelulabub.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/bofafupaloneb.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902231507202708.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/zipev.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/44640213655.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c7460ac298bb370792c9f7ab861bc1c5/6964253702.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/49496945019.pdfIn PDF document text
    • http://christopherdallo.com/file/83605519130.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/99844493060.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16147df659d534---25016915893.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/todofakuxusewabakuko.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_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 11008 bytes
SHA-256: 016bdfb792e28607095aa340c729f46a483e3cdfe096baef03d430ae9a817d66
font_01_sfnt_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 20280 bytes
SHA-256: f1c7cbedbc5fe5f5da68ca789e5a3668dc3c9d157d90584d8a9780b18d3a32a5
font_02_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1