Malicious PDF — malware analysis report

Static analysis result for SHA-256 80533dce23bf8710…

MALICIOUS

PDF

73.3 KB Created: 2021-09-09 08:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0754d3e364f2850b415641dacb64cbe1 SHA-1: 98275ea9e0be1ace7f175b7f5d93c6281a015686 SHA-256: 80533dce23bf8710bf9607b129433e0b0a6cbd60f10ef9befd8fc1db6cc87ecd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://thucphamchucnangmy.vn/uploads/files/50541538516.pdf In PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/revixokolo.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/bamuxuzatelu.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/3880200134.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/40017187520.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/52671513477.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/mogazawizumijusiweliroz.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/sirosajadabunujun.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/44929922503.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/5980621750.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/28311867928.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f02ed16b5---magugoralasitosiwikimib.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/21634968561.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/62305936134.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/87727716121.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/batifu.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/15961069483.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zewujiga.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/15893776139.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/50157208391.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/votuxefawadisikigibub.pdfIn PDF document text
    • http://zzquansu.cn/d/files/tezuvinaxinerupovuz.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/tetisofadoka.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/haae0bsunodhlsda1p4ea5ac8p/27264381502.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/62249839243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+phones+getting+hackedPDF 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_off0000bd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD62 10820 bytes
SHA-256: ab6dc01a64f540277989acf4b16c520cebe1cd3a81a8d61ef3585fa924238e68
font_01_sfnt_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 16128 bytes
SHA-256: b1bf73f1f219bd3abb8b588a5dd8a07982fc4af36b0100d5f03d42256631f40b
font_02_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1