Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5dfaa24ecada11…

MALICIOUS

PDF

74.9 KB Created: 2021-09-09 00:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5176ac39a9c71437f518e9c443ec0e67 SHA-1: a70648296dd6bcf7aef8d353379afe38d1810a0a SHA-256: 9a5dfaa24ecada11ddc917eec22fed6446cf3fae0eb11d0c692012c6f179cfe2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns suggest it's designed to lure users into clicking malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef6b8613c---99992325664.pdf In PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/sipiwi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc0ca9382---69016665993.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e7a24c48---44948020607.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/50896424523.pdfIn PDF document text
    • http://devison-matras.com/upload/file/67498216914.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/24062822872.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/14445940942.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/gijigop.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fukovigefekedasiji.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/66911787851.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/desolekarexiwof.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///fulos.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/jesotoverikagulinemasi.pdfIn PDF document text
    • https://fratellifurloni.it/file/39674901566.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/vusixogusunudi.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/70120732267.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/30616559958.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/fikoripokopukepet.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/30126103199.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/73539654848.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/41180875041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=nintendo+android+appPDF 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_off0000c2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CC 10148 bytes
SHA-256: 145e6cb9b2fa4c12988cf036ac6caca19d1c018691aec1b485f24219aadcfc68
font_01_sfnt_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 17372 bytes
SHA-256: a1c8825ed1a789af1641e107065ae6642337e3eefbe6598bda34baa1d98ae0d5

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