Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f588cae3449d63…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 19:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b1086c992f13b7a974d1163ca58bf9a SHA-1: 6706baebef9da1ce20d17d8628714fc71705f446 SHA-256: 47f588cae3449d63cc11d608b45f533d381040e358343e91fb99978bed34fe34
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/zanatuxeworudefiwil.pdf In PDF document text
    • https://cvsc.co/userfiles/file/48974036488.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3o62iioou9k0r960n6en6se00f/81126579482.pdfIn PDF document text
    • http://rts-3.ru/upload/files/28315468956.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/wagivovatag.pdfIn PDF document text
    • http://yibetter.com/data/files/68744791930.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/garutopegekez.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/83494989925.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/dasojogupenekuk.pdfIn PDF document text
    • http://msiutilities.biz/documents/kamedowijumilar.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/vanaduno.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/jutagenedepakugiliximo.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/vizulijoz.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135e85f08474---44251732395.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/tutajarimo.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/leror.pdfIn PDF document text
    • http://biosite.ru/images/news/file/46244938431.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/64682217140.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/zebapufuzanuli.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/libupifa.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/lonezuvaduniwivut.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/79637684182.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/pedonirilowivajaleri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=thoptv+for+windows+pcPDF 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_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 10492 bytes
SHA-256: 7f83f2a13b960bc674588f9c388933519350e7b8c76683c6aa42c08aa92c7d20
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 18136 bytes
SHA-256: 0903472f3ffbd8379a434ce6cf0b86cfc538702f084152739367763d563b002f
font_02_sfnt_off000130d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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