Malicious PDF — malware analysis report

Static analysis result for SHA-256 e921da3cac400c2b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 21:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9e67621c71ce627755635b6e2e4ba6cd SHA-1: b32176b7b90406b114ed063a4e9bc0c10dfa593a SHA-256: e921da3cac400c2b4aef0b1f0e3f61c92851a18e4cb6574ab528ac6a67fe8e62
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 heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious PDF files. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://phuwangnam.com/user_file/file/7194053360.pdf In PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/29651693386.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/33585785928.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/lavonigiwirek.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/1518405648.pdfIn PDF document text
    • http://thepducphat.com/upload/files/55007609278.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/vawibarodatolelu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa8deb748e---rufoxanekafudeketebu.pdfIn PDF document text
    • http://client.diffuse.info/files/15022150279.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/popizudakozarulosore.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/45070433676.pdfIn PDF document text
    • http://arsvet.ru/img/upload/tidevokakaj.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/58669303313.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/24776252328.pdfIn PDF document text
    • https://mahae.hu/files/files/45314494060.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/82415041380.pdfIn PDF document text
    • http://na3.it/misc/file/zevoleliw.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa7619535---vubisowimipul.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/57510411211.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/19216303660.pdfIn PDF document text
    • http://airzo.net/userData/board/file/bujajagiguxesasen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=autonomic+nervous+system+is+divided+intoPDF 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_off0000bb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB58 10584 bytes
SHA-256: 9c8cecc35e91fcf990b8241cedbe7e656f9b20e0d6577ce1cf650d2b39a15afa
font_01_sfnt_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 15240 bytes
SHA-256: eb6b4bd79d64df9c1445c8573a995887ca30c05e1968fb51c0989121bd23ff6f
font_02_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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