Malicious PDF — malware analysis report

Static analysis result for SHA-256 26aa6ff9b0ee2b46…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 05:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38285cb636b9e0dde109acf6103b79fd SHA-1: dbb2d8a77421dc76d43d7bf7fa4d5df6d39c95cc SHA-256: 26aa6ff9b0ee2b46fbf2c5c9779fbc9eb39a68609f80007d18eed9b79b5db9cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and numerous external links are characteristic of malicious PDFs designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=free+full+movie+streaming+sites PDF link annotation
    • https://www.adoz.cz/ckfinder/userfiles/files/wagenapegorefosuxorowulir.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/gujagoz.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/98705331694.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/16322286505.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613775ea29674---98868761256.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/jonidibozutefagafotenami.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/dujevewewanuxelerubeji.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/jusudubopedasix.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/kikowe.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/xijikofezumagi.pdfIn PDF document text
    • http://hrudolf.com/userfiles/68803866307.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/nakepake.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/89761919279.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/vepopululavexonu.pdfIn PDF document text
    • https://hoongnau.com/upload/files/28706020457.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090310185626.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/74757612882.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/16684350601.pdfIn PDF document text
    • https://premiersuli.hu/files/files/repawotiji.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/7260578820.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xifebumopetomulowo.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/zavawofukuzafase.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e54b4463d3fb37e98bea62273bbd448f/muxisotejeguritakerimi.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_off0000bdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC0 10700 bytes
SHA-256: ab02101e85cbb734c1c956c53b3cf40ee2717cf076a978ff6f6c30fee195a862
font_01_sfnt_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 15956 bytes
SHA-256: 2feefda747a597b399f9b996e671b239f855fbdd2b490a254fa13b7d781ccaa8

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