Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63fdaeae2941fbd…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 20:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1129d7bac44537790715ff8acf01944 SHA-1: 755c6264fe94816a7975bee77f891d0d9cd19f04 SHA-256: c63fdaeae2941fbd9a164cd03296f705f4d12df55be90111f8845e74a9047bbe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a deceptive structure for external linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=jak+odzyskac+skasowane+kontakty+android PDF link annotation
    • https://bokaichenyu.com/upload/files/9266566644.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/97374754168.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/13335590336.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/28382554880.pdfIn PDF document text
    • https://istanajp2.com/contents/files/mirisusosugolawuwi.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/50567666676.pdfIn PDF document text
    • http://www.siposferenc.hu/html/90739723788.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/65122494489.pdfIn PDF document text
    • http://webursitet.org/Files/file/dorisegugujiji.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/luzexajopi.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/bojotili.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/bobetupidabe.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/12887388492.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/52123742175.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/28266448540.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/48446841380.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/2635856032.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/saxovetesutixalajedile.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/17396412675.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/tarewewudebuz.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161410cdee82d9---sirojijedaxupo.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/wemozixoxiwitelimiwuwuso.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_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 17300 bytes
SHA-256: a8ebe39d9bb1a28a4ec158df9bde33a6de549d2e788009695f2514ea69989105
font_02_sfnt_off000116eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EB 10660 bytes
SHA-256: c17f1355f08641cacc78a6ab03646aef192319ebbf514e134b77dc8010e4a9b1

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