Malicious PDF — malware analysis report

Static analysis result for SHA-256 1768f9791cac6168…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 18:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe781e9154deaec317e5a04a0abc096f SHA-1: 11c3cfabfebd5ecf34ff7b62a6a94d1f62bbcd75 SHA-256: 1768f9791cac61683f945292f3f2f8e037d7bc246329035129e26946974026b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to potentially malicious domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mudrkanuch.sk/editor_uploads/system/files/97547426742.pdf In PDF document text
    • https://dragonexpressml.com/userfiles/files/poxalofuboguruwajativad.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/sikunijofogano.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202108311836148402.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/78049791362.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210903155535.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142ab03b9fb1---75357280836.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/kitigiwepudefelo.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/xefikoxi.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/50186029633.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/wipenarisibesunodisofiwur.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/83699291654.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/kudavugokug.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/tusasujavavatekuxexowi.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/vifutupobitiporunazep.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6cb52016---43690078319.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/17077708275.pdfIn PDF document text
    • http://uco-kampen.com/media/files/tagorejume.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/kiboxi.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/numulakan.pdfIn PDF document text
    • http://pedraferro.com/files/files/fabubemimaxuziwaru.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/66405874489.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/21006030721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=solve+for+x+intercepts+calculatorPDF 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_off0000d5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 18916 bytes
SHA-256: bda7db8b01a8f34fb8a50749f764140dbf5f1e35ec5417cfb0e25f6f244b9bbb
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 10816 bytes
SHA-256: 8785c36fe1ba78f87785583caffa2351d53e080fabdbcdb3dc45b75c6e126d9f

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