Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b75c329db200d5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 06:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16dcd1026f7d665ef1b8a2b3c732c1c8 SHA-1: 8e40abfca5c800097f45d5715652b44f691dc785 SHA-256: 05b75c329db200d597c980a16de506944b917531fdb61592473b7d846de3ece4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, redirecting to various domains, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=best+th9+army PDF link annotation
    • https://beldapin.com/calisma2/files/uploads/nifosula.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210908_67D35C18747E1185.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/86105062296.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/javanun.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/68820856053.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/zezufajudenoraba.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/16076105969.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/58686754772.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0eb9bf86836a5f151952d0b1b28bc25c/83752372265.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/38787679406.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/jewoxobunodi.pdfIn PDF document text
    • https://lecachet.fr/docs/files/37207344775.pdfIn PDF document text
    • http://jadeite.ru/images/file/83376342149.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/mokegujukipi.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/74079519137.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/92800415430.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/kakovilife.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613637916773b---53171168387.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/35416670235.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/29963737895.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/mudewafefogow.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/16387884352.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_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 17448 bytes
SHA-256: e8f0245d31ed22bf8a8c78c7ff10db560b1f7cf22f1f665f2bd917b7a922c03f
font_01_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 10348 bytes
SHA-256: b5d20c8c340fee3f33e43ea2e15ac3a178b7a37dab64d41b8a2ec49c8c3111d5
font_02_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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