Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c0a66968d958ec…

MALICIOUS

PDF

74.0 KB Created: 2021-09-11 19:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d77a36878cddc85e81145725a7244475 SHA-1: c2ca0198db737af88c55636c8fb12490839c8604 SHA-256: 62c0a66968d958ecbbfa3fc1b1fab9e3ff750aeefb53e2bf6d981c18d4c1ad50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious domains or link farms, suggesting an attempt to redirect the user. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic of using many distinct, disposable hosts to obscure the true destination. While no scripts were explicitly extracted, the nature of the PDF and the embedded URLs strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/kenum.pdf In PDF document text
    • https://galerieportelouise.be/userfiles/files/32037213553.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/82033077289.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210909131857.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/20167766274.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/41536842845.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/19840952365.pdfIn PDF document text
    • http://rsst77.ru/upload/files/27563281880.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/pewezezupatowo.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/sukuxubakunoxi.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/71132256257.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/nonepefidulotugina.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/98410601240.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/41408837932.pdfIn PDF document text
    • http://reichspfarrer.sk/file/323104859.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/31476239238.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/wakebifaselopemuposeraj.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/juterabigezufuka.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/kenerulexemoj.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/71728144205.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/mogikivafudefi.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/29579588127.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/gumewerikuwalemabojeleli.pdfIn PDF document text
    • http://ymmicro.com/files/files/39692334892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=captain+america+civil+war+movie+downloadPDF 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_off0000bbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD0 10688 bytes
SHA-256: 2955404cca7c979df043059b8f7804ff44470f790186d696a44d384d12609ef6
font_01_sfnt_off0000d451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD451 17856 bytes
SHA-256: acd0feeedd1c62f72fd88d3148d0b1f89b74d5b7bef7cd493c89152b5bffef88
font_02_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1