Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf90849873bef8a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-08 23:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77665629ea0c46787cd1f9c6e7c0ac91 SHA-1: 43e3b7b235535ac4d81aff2e32dfe4d58efa6141 SHA-256: fcf90849873bef8a17c5db30338c2e3133f65db4422c0ee9f6a15de84c5e159c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The numerous external URLs, many pointing to PDF files hosted on potentially disposable domains, suggest a link farm or phishing lure designed to redirect the user to a malicious site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://eventpro-kontraktorpameran.com/uploaded/files/71876286130.pdf In PDF document text
    • http://dpholding.ru/uploads/files/bubupad.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/67552227082.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/me43m9r99e9dl4a7smarprh385/81000295133.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/eirmituvj5jsuiqj5aophimufg/bonixanalogitebozizegij.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109060045267992.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/61417802281.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/pedezazaseturuluwubab.pdfIn PDF document text
    • http://bdsductri.com/upload/files/jitupewezekipezi.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/60870451437.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/nosegalami.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/naxumuke.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/15052021336.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/64697964769.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/29409334674.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/sesowevoxagugogixegax.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/woxori.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/061939508195.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/73389891552.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/52890546723.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/78272183071.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/3765475674.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/41220168867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=turn+on+email+notifications+androidPDF link annotation
    • 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_off0000b103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB103 15292 bytes
SHA-256: 5a0e06a5a128b708f19a8db9a20b66d27ffb1edda19f565045e9cd6a5796ea54
font_01_sfnt_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 10700 bytes
SHA-256: 4a5294775a7540bfb6fbb486dcf47e04edf18e04d8f555d6d6ed0db7a67195d9
font_02_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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