Malicious PDF — malware analysis report

Static analysis result for SHA-256 47981a1f10696662…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 23:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01eda66b6fbb8d0973384fb662473fad SHA-1: 3febe18083c3781dca84073903ccfec62439ecf2 SHA-256: 47981a1f106966624c04aa5be5f6e17753215d77f59810198c6046ab10ecf3f9
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 contains numerous links to disposable hosting, suggesting a link farm used for malicious redirection. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hohsingfiber.com/ufiles/files/14318271912.pdf In PDF document text
    • http://giorgimpianti.com/userfiles/file/tagaporadogevelixe.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/xarunenodenowu.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/jikemojisabopimojuzenija.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/20737782816.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/43864519674.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/38040905195.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/84098895010.pdfIn PDF document text
    • https://tipresentoio.it/images/file/xuwobowanivosemubara.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/74205325104.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/cb15aaa4d999853d22aa02771894d89d/23866808538.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/noluwojitupoxamivilib.pdfIn PDF document text
    • https://endobible.com/userfiles/file/damasuni.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/15269006078.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/runozakumamazelik.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312c45d7cc9---mudidukovitibip.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/41544739514.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/42884399111.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/13954757928.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/61238571302.pdfIn PDF document text
    • http://enricobarraco.com/files/gamuxiv.pdfIn PDF document text
    • https://kimcert.com/E/file/51968690681.pdfIn PDF document text
    • http://osayit.com/images/file/61932478275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mouse+wheel+speed+testPDF 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_off0000af37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC749 17448 bytes
SHA-256: ca32fd3c975be76cbcfbc0fd5b421005c562566f86f7580e51935d9098757870
font_02_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 10208 bytes
SHA-256: 176c1729523dd60a5b035529389b836fc24a65e79cf4630c4255398014b8ae7a

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