Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d459c979596597…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 21:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a63146a487aa7db1f774a86a227d5d2 SHA-1: 093f187151eb2c3f015e181e617237bf4bf5d098 SHA-256: f7d459c979596597825fbf30d52ed13b9712c889de9e63e2e1b5165674b92194
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The PDF structure and the presence of external URIs suggest it is used as a lure to direct users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=most+popular+mobile+operating+systems PDF link annotation
    • http://slovbau.sk/test/userfiles/file/bemerapa.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/nizixozuwidaloj.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/66920326759.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/81303192262.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/tobawunetipifeze.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/77909105705.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/94909420263.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a875d32d93---xebarobe.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/nulinokenunerudisilota.pdfIn PDF document text
    • http://orderkai.com/uploads/files/musiforawafebexame.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/vuvunemiwupuvuzufenizuzoj.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/98262903129.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/kuwufupadavadavawusivuxa.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/vesepezabutubu.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/95643410403.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/49482801526.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/72447868751.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/69736603472.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/85551348963.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41e7d113d---vugofanofomebepipowegit.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/jajuj.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/19767507709.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/zunimobezavefewiriwan.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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 10944 bytes
SHA-256: 35289a82ab46b2b8c3bf7f79bb8b7dcbed4016335e25be3873911f154496fe59
font_01_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 17516 bytes
SHA-256: 448363d2e5e4b7d169062b5a4292abdb241f6112ebd98f261344ebe4512866dc

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