Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa8e6fc16fe59df…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 17:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 953e65998d832f46d10a34186acfbb37 SHA-1: f033e359c1a2a5b51a9aa0f411d5c7c8e35dfa77 SHA-256: efa8e6fc16fe59df54b93008be914ebbc72fbebae1d3d9f16f08d63630faf0ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm, suggesting the document's purpose is to redirect users to potentially malicious sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://karinbentum.nl/uploads/file/zesumulepijatovoselare.pdf In PDF document text
    • http://zenithmetals.com/files/gitowofuduwetifirik.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/baxobidijeku.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/76208813794.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/xodemorem.pdfIn PDF document text
    • http://parfumland.sk/upl/97368835559.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/jamixifuretewe.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/66055076118.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/10608255410.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a61b22be---14790222098.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/47823940267.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/21890784904.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/34037421288.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/katujejikorununeleko.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/40904053463.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/nivamobevezix.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/vesabizigodugevukoxixevum.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/barilefepo.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/gomepaw.pdfIn PDF document text
    • https://euchebnici.com/img/file/kefapivigukexanejosukove.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/ponom.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/50170560613.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/roluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=black+pac+man+ghostPDF 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_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 17088 bytes
SHA-256: 84b7166b35cab1dda1061b7336d3db5c5aee9da05144ffdb59550871d1d9d4cf
font_01_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 10640 bytes
SHA-256: 89c19feadcc7f4f388c88d8cd34405c7c92da80bb486806adc920c1b0ef8b676
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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