Malicious PDF — malware analysis report

Static analysis result for SHA-256 882974ec21d1dbfe…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 13:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8cd92a30a10b65afafe611326abb30df SHA-1: d5ec294813c4b15c5a9470c50dd7d928699e256c SHA-256: 882974ec21d1dbfe79cbc773383e73baeffa009e96173883029a804173a83bc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that this document is part of a link farm designed to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=toca+boca+neighborhood+apk PDF link annotation
    • https://bestofbucerias.com/upload/file/gebopezewo.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/94242155559.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/85380069096.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/64591833702.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-2/20210902043019514131.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/buvutanurogitogedi.pdfIn PDF document text
    • http://davcpundri.com/css/file/sozavemudepen.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/mupirezugopudinosutose.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/22511074121.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/87548913923.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec44e0dc6d---bulogeruru.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/47246236941.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/86337316827.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/bimipojutadebofiniwemase.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/66294987400.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/90632813093.pdfIn PDF document text
    • http://arsvet.ru/img/upload/woxidenim.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/46145030896.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/84775151669.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/jibugujupotenosa.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kevawamidejapo.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/megevuvevo.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0227a7733b76025e6612b66a23c5aafc/69551879982.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/22314398637.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_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 10676 bytes
SHA-256: d77ff07389d8b201cff9de4390c0294563e3a2bf6a26213bb94f41b5acf3d688
font_01_sfnt_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 17852 bytes
SHA-256: 6c7d66d2fe599af5b25181697f8ac035b35a30a1afc50f0d411e121e0a0cf4e4

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