Malicious PDF — malware analysis report

Static analysis result for SHA-256 480f2645fa9e65fd…

MALICIOUS

PDF

123.0 KB Created: 2021-09-20 13:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de7434f73308d39132d017b5e2808900 SHA-1: c3eb777aa3607404a9bf41e1265818a092cf6178 SHA-256: 480f2645fa9e65fddc9fbb6e56d9329a9f022ef0e3298f26e37ffc2e5ad9307d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://learnersdigest.org/userfiles/file/suvekigijeberefuwuvazefof.pdf In PDF document text
    • http://intelekt.biz/uploads/pages/files/82656110333.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/vejezifoz.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/zaxidudelatobi.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/juluwiguposuwo.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/60434276867.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/woxivowixojorewi.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/93260346815.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/xowowep.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/wewawoxovudimazatox.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/gibujixodufafuj.pdfIn PDF document text
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/56260574139.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/jokozavukawisite.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/71719462968.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/97455343151.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/fanokuninero.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/koliz.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/86918428337.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/kosanek.pdfIn PDF document text
    • http://soc-in.com/data/media/files/24753630794.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/93458217783.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/semijimabizukuvejuzofutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=earliest+civilization+in+chinaPDF 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_off00017a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A8C 19540 bytes
SHA-256: cf27b1d6bb7fe8ebeb73a3a4960542ae358f993de23c1e5b0aa991224fa682b2
font_01_sfnt_off0001ae07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C61E 10436 bytes
SHA-256: 76593d9750c08f85a8dd4af04f5ca12d05236c0274412ef2159ebb3d72a9bf95

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