Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b281ecb249b6de9…

MALICIOUS

PDF

77.1 KB Created: 2021-10-08 04:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 752366ee55a86483c391604187454e3d SHA-1: 76aca2b34ae0c19708cb69d93cfa54846abfd78f SHA-256: 7b281ecb249b6de9344e7f525bc129395ed0d68cc80de317fbac47877c275cc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing lure. The 'wkhtmltopdf' authoring application and the presence of embedded URLs point towards a phishing campaign disguised as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://allytemp.ru/uplcv?utm_term=project+plan+document+pdf
    • http://franceplus.fr/userfiles/file/vejajavuxufowopezogumavon.pdf
    • http://dichvutot99.com/webroot/img/files/bipudenovan.pdf
    • http://kadh.kr/bobod/upload/file/revewugaketuvalivinubif.pdf
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/67288362658.pdf
    • https://bodegoncriollo.com/userfiles/file/93972079508.pdf
    • https://yukkumpulgroup1.com/contents/files/27076334533.pdf
    • https://sangolongphuong.vn/longphuong/news/files/76357467169.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/sarajepejonixorare.pdf
    • http://uniquehotelsolutions.com/files/others/rejexuxupipiluk.pdf
    • https://mimpishio2.com/contents/files/xewarowoxofonogujigug.pdf
    • http://tolltisztitas.eu/userfiles/files/joguwuxipezi.pdf
    • https://worldtradezone.com/userfiles/file/72655906208.pdf
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/59371822528.pdf
    • https://viettrungson.com/media/Files/9922513079.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/96757910652.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161432365f0ccd---72749889587.pdf
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/4251254662.pdf
    • https://iqrainternationalschool.org/_assets/files/65193674265.pdf
    • https://gaadalagi.com/contents/files/61074817939.pdf
    • http://www.bash.cl/media/file/21602245588.pdf
    • https://www.institutvzdelavani.cz/files/biromirejuvikarowefebefi.pdf
    • http://avrig35.ro/uploads/fck_editor/file/81146188142.pdf
    • http://ibtaker.ps/userfiles/file/82039706503.pdf
    • http://razvoj.e-podjetnik.com/ckfinder/userfiles/files/18125829324.pdf
    • http://ozkayalarlojistik.com/userfiles/file/zofedekodidufiki.pdf
    • http://st-johnson.com/Uploadfiles/files/8463195616.pdf
    • https://tort-art.ru/userfiles/file/zilozitakesabinudegufa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 16792 bytes
font_01_sfnt_off0000e47e.bin
0516a805f17a0d1b8497c4c6f987dde4b50e340e73f5366246d4ddc4eb75304f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 16220 bytes
font_02_sfnt_off00010e16.bin
b2f8572f44c62d5b14b498d918c45188b0e74943a43b8a9b68cc3454b85c046d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 10752 bytes

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