Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bb5db2294d0bba…

MALICIOUS

PDF

89.2 KB Created: 2021-10-06 18:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c98176be3bafa5c606ffea658a310de SHA-1: 13690b3ecd1c22d9dbd0b5be309ad8bdd7742c5c SHA-256: 40bb5db2294d0bba580a048dee571ee844fc4fe5092301ed710ef9b47b41d491
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious intent to host or link to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gsc-tw.com/userfiles/file/36016801063.pdf In PDF document text
    • http://itagqatar.com/itag/file/files/fujozevexitolomije.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/6226938373.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/67897084396.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210906185542.pdfIn PDF document text
    • http://24cvety.ru/upload/files/95057611034.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/tulotokomasosulakagexo.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210903_2222F1C7D99E0202.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/88724998322.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/nenojoxomepoj.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/fonerara.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/faxewugazeg.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/savedalalejo.pdfIn PDF document text
    • https://rintrans.com/files/dikivupezateged.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34849853452.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210925125810_2145334836.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/84058628746.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/pemuvepogojipoxonawavavir.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/41362546543.pdfIn PDF document text
    • http://hueide.com/upload/files/xurexoni.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/dirijetewapemew.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/58812427048.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bb6590489f1b526feb9f7c85a17df127/xuzibixigaxeravusus.pdfIn PDF document text
    • http://wawa757.com/uploads/files/2743211254.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/15215822418.pdfIn PDF document text
    • http://karczma-zaborow.pl/userfiles/file/kerit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+clear+watermark+in+pdfPDF 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_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 10784 bytes
SHA-256: 4a45517118494077b33edfb366180c23e1d0d8cda8c1ae42e720427c8465d841
font_01_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 19408 bytes
SHA-256: 0e3a3304f2ef8bb45b866b78be3844be01bbed1b898954a6ced2aaffedb8f28a
font_02_sfnt_off00013ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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