Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a32370edbe3b882…

MALICIOUS

PDF

78.2 KB Created: 2021-09-11 19:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c035488e0cbe6a033be23ddd7fc5753c SHA-1: 5e5e01e99506ce87194ae6a2cd9b8e0e4817c797 SHA-256: 3a32370edbe3b88289b590470569d1f86106151d6b1c531e76a718bd63043c5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm hosted on disposable domains, suggesting a distribution or phishing campaign. While no scripts were directly extracted, the presence of numerous unknown URLs points to a likely attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medicapoland.pl/uploaded/file/76717286776.pdf In PDF document text
    • http://polenes.cl/userfiles/file/78696182910.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/refaxixiwasobakivetivi.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/xulatedalekuwebiba.pdfIn PDF document text
    • https://bnovum.hu/downloads/xapusoruvulakuxawirawima.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/75078249522.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/lotabevitomabupega.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/wefifeninepadofidoruri.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161313957a3854---soxefoxesule.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/wojakagesawitexal.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/rezifizumirefo.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/98014558739.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/sexumodafuzamegug.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/vudibibe.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/namufigozir.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109011107479537.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/23205460683.pdfIn PDF document text
    • https://amgaa.org/temp/files/suvowusuxozokezazobaxijuf.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/15809826975.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210911211012_f4x4bs.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210909205719649.pdfIn PDF document text
    • https://chineseclothingonline.com/File/85407791589.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/luriwopaputo.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/kedajinugut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=plants+vs+zombies+2+hack+downloadPDF 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_off0000c7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BB 11100 bytes
SHA-256: 2aab4e87800aac2e148e013934a1df1ad386156a68c54090bbc10144db706d23
font_01_sfnt_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 18900 bytes
SHA-256: 317aa94cd4e5f6b36866d8e2cefac18db068d07d12d57b6872422a93278dd3f8
font_02_sfnt_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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