Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39b7413b2a7d5f0…

MALICIOUS

PDF

87.5 KB Created: 2021-09-18 18:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b56d87e5801dc85af8ef81a545b227c SHA-1: 2ec6b3532e8e1fd8e6d5df64dfa4081bdb25da55 SHA-256: e39b7413b2a7d5f0c533c1c6ef7abbe042e7cd08f141bd62cbeba4351f5f3563
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://dkkarsin.pl/img/upload/files/sowowobunixupowenujot.pdf In PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/30165591784.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/46271801140.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/40031921547.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/44226934724.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210913161341.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/17387635264.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/60861924086.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/51691599984.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/numanomoxopemosepatuzi.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/seguvufomuxug.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/xavotebifelexib.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/37139836662.pdfIn PDF document text
    • https://actorconseil.com/files/file/25458638376.pdfIn PDF document text
    • https://led7.ru/file/fegogezilawada.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/sivokawesumuvaxumivibe.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/89776060478.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/pirelaroje.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/vopin.pdfIn PDF document text
    • https://telorgabus.com/contents/files/47097872406.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303cbc120fe---192315846.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/begifizabato.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/ravulilemagabumipa.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/99624472645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=csr+racing+2+transfer+account+from+ios+to+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_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 11024 bytes
SHA-256: 342b3bd735539eef7caa1dae92f36c590f88315beab91d68a1c33e424ccc365f
font_01_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 19440 bytes
SHA-256: edc60fe6fb07891484fe0ef62e0e4c64b9153864caea5e3f3c4089b41404f452
font_02_sfnt_off000137dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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