Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22f68aea95a891a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 05:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d535c9fbc22937e69782952232d61e10 SHA-1: b6f80f8de7cb431b91002491b7b34203ddd85d2d SHA-256: b22f68aea95a891a2810a7fadde98db6b953699d01f01ca079899892cd3f54fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating it functions as a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or distributing further malware. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the link farm nature of the document are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=what+colors+mix+to+make+light+purple PDF link annotation
    • https://eseninternational.com/uploads/files/wawop.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cb3994534---71539039579.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/pigor.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/98408835157.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109161255387884.pdfIn PDF document text
    • http://clerus.hu/files/file/dozuromijur.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/muvesixezodasoxamuxeluw.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/6437988951.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/sefunezaxa.pdfIn PDF document text
    • https://invision.buzyhub.com/files/liline.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/83783639108.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/dimebino.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/10699595397.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/81049838191.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/nimejux.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/49702208273.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/susibiv.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/lafujejafipatewabuder.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109051115426282.pdfIn PDF document text
    • https://estoniapools.com/contents/files/81224995756.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/87964726175.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/bewofiriwaf.pdfIn PDF document text
    • 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_off0000db47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 11004 bytes
SHA-256: 0f842f471a515961a425829e441a67d196c924cbba225d7ba56fc7923dd40ee7
font_01_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 17432 bytes
SHA-256: 69b5d048159f3b3d32057ce4fffb52f1fb7c097a6715a7af5c87c3aec0c9026d

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