Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7618c71e7f27f9…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 03:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f97ec7d222c24c10276f8302dee55ecc SHA-1: 8603a665cdfc4a07b1c4478c70a4e876800244b6 SHA-256: 2f7618c71e7f27f996358e5684ea287f8e7b571a0362e591512dae880bc89c93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or scamming. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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+audio+cutter+app+for+android PDF link annotation
    • http://webinaris.org/ckfinder/userfiles/publics/files/boranajerudosewokugamoz.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/gufibuso.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/17515991325.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/98505222800.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/wisekewonafisaz.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/katunosarubejunepiz.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/76407342748.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/zomokabuj.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/53463754128.pdfIn PDF document text
    • http://traviet36.com/upload/files/vimunuzesisi.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/32756829951.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/60164236727.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/xareketaxe.pdfIn PDF document text
    • http://castel.lu/userfiles/files/loneduwonewitopaguzisin.pdfIn PDF document text
    • http://kechengchem.com/upload/files/97590261186.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/88575490864.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/vadanuvijajafugupafomutat.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/mejenifenot.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210917192019.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/sikakipuka.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/756f67a3b44d8f64887565ceaf1f8729/12386123061.pdfIn PDF document text
    • http://jiab.net/userData/board/file/tinudijijakuwuj.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/zivapelazajidiki.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/43675695023.pdfIn PDF document text
    • https://blogsma.com/files/50065241377.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_off0000e9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 10720 bytes
SHA-256: 5e5ab4a6928dd14a72644c29ec21ebddeefa0973ce232e5b8f44d206ac5d0184
font_01_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 17168 bytes
SHA-256: 0f99efb6e3f4272038e487026937b92fd088c5ac1978f25bbc15a2cc494c76cf

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