Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f385d4c7c8ee9f…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 19:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d3f8c784ad12508b3e420b41ad162524 SHA-1: 359f53e158d5720181b301a338a1a46955172e93 SHA-256: b3f385d4c7c8ee9f9dc4f2fb01c64e7889039e0b0ac2c13da872c69e11181a89
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to host multiple files, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 http://fsanaq.com/upload/file/210914035206617251d9909hlcxnru.pdf In PDF document text
    • http://leeandrewdavison.com/download/33598900283.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45637843420.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/16304169824.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/9402347847.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16147fe91906a8---nesadokurujonener.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/wonowizajejid.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/vurilapofusewufuwuxani.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/tolipiluvagalumig.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/vonomopip.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/zamilofidogufe.pdfIn PDF document text
    • http://mlight.cz/archiv/file/ditovofapu.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/gifemukumeponokel.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/wisapinudulepagokenavib.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/pekurunaxefigurugor.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/revejutasobajevotidovi.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/rugikegogiridimuno.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/lewabixotalivenof.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c7fb45354---goniji.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/sekopomo.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/57914692932.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/37137672950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+wwe2k20+for+ppssppPDF 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_off0000ac69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC69 15408 bytes
SHA-256: 0053e1468b3b1753b3d3522027262a3794ea041a549692618883e22019a68508
font_01_sfnt_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 10720 bytes
SHA-256: fb243c93d01d9420cc346aa5928b0f33b2ce276d614b7a3b1e9d5134a7d0e355

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