Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc90a4ab3a28687c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 17:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5f3a88c7d0a6fb11e1e4bc0e6439766 SHA-1: 0c415804460fdb90d8e735036b57ca208f431518 SHA-256: fc90a4ab3a28687c10e2d62a4b1174c645f0c04780621e0e21b31adccce2f1ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is part of a scheme to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=uncle+tom%27s+cabin+bangla+pdf+download PDF link annotation
    • https://zakazspbwatches.ru/upload/files/13838288949.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/detid.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/wudadanupadofirusaxizaf.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/lazameraxozume.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/64388baf9a37944bd72e49f3d8266d83/211414608.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/gajabavub.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/nipise.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/72875597615.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/fanidebidugubenisuxejulex.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/buxigeteziboziboruzu.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/92374889181.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/2905810686136d7086e7c4.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/43908804813.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/91063853466.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/toxesokoxeraxa.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/makikede.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/21361991154.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/kisinej.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/goxuk.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/dijadiwuluvubuwina.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/72815881779.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/litidolugi.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109011253429264.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_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 18504 bytes
SHA-256: 0d1963e498f5ac4c9eadf0ddf3329d71164cb97d24d8dc9875d3651a6df93429
font_02_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 11132 bytes
SHA-256: a194a9b169d42fd14734210e2b8d7f1ca6af2f717ab96de40080ec58fb5a739f

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