Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a5490b1ae84bdb…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 06:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ab4401110345f101b1ba7d6060dc8a9 SHA-1: 6b5755798374ade0f3a426d32f7358dd2a194fa0 SHA-256: c3a5490b1ae84bdba34deb29007a3a19ccb532eb67e20c23d5ae8dd6d52e96ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as a phishing lure or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=url+keyword+analysis PDF link annotation
    • http://smwiarus.pl/ckfinder/userfiles/files/7883912977.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zitigizekufel.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/71015940634.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/sojolibonipatefofube.pdfIn PDF document text
    • https://carlojans.com/cms/file/39883649757.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/64118435523.pdfIn PDF document text
    • http://esangsok.com/upfile/files/70102321715.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141d1a629c9d---najaxezubeg.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/2336962436.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/61224871101.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/20174288456.pdfIn PDF document text
    • http://fxlcd.com/upload/file/51750851371.pdfIn PDF document text
    • http://leton.pl/userfiles/file/89644607347.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/53442248627.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/xateginitiz.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/86076198683.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/selobaberozuguxulowegata.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/zorofibosidobovevowaz.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/10702160231.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/26515220414.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/xumumodupirisur.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/zugutizevaxu.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/livewadofomabupabufomo.pdfIn PDF document text
    • https://geniodelweb.com/file/11005297296.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_off0000c457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC457 10440 bytes
SHA-256: 35a807404dfb20eb33fa7aed7f844a39e0a8c4c8b37afab2a6659c946bdbe6fb
font_01_sfnt_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 16656 bytes
SHA-256: 66aedb86f7857b9d3f3e6eecb11ed3b30b3f76fd337db3036332687f973f79f6
font_02_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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