Malicious PDF — malware analysis report

Static analysis result for SHA-256 81263dcee56a5bab…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 02:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3357ec0405e0ff9dfbf0524f12af47e SHA-1: 688e232352d1726fc7c31eb79a4767747a378401 SHA-256: 81263dcee56a5bab2b33d64524dd282496ea347223710dab7c0d9bcf980163ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious. It contains numerous embedded URLs, many pointing to PDFs hosted on what appears to be a link farm, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

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://istanajp2.com/contents/files/87095116971.pdf In PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/76713453539.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/makagilelidedib.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/90192891568.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/fumojezevevokevoj.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/35279808263.pdfIn PDF document text
    • http://coffee33.ru/archive/file/87296548037.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/fuvaxarunu.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/49377809628.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/gitevufezasifexamitimejom.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109022310373457.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/fafoxodibokagaz.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/39219598771.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/112220288032.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/2516181624.pdfIn PDF document text
    • http://dreptultau.hotnews.md/upload/userfiles/files/83162277945.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/tapigisutinidozapa.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/36763857690.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/89593786432.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/03/file/20210903_080243_118.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/8376512579.pdfIn PDF document text
    • http://erex.hu/upload/file/xiwugumafoloxat.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e99a48f1---lubijizatalife.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/52829923510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf2go+to+excelPDF 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_off0000bb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35B 10248 bytes
SHA-256: c32a872c952a9887ff60b69fe272e44ff318b411ec22f062d985a94df2d8a043
font_02_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 15904 bytes
SHA-256: 49344886064000b5ea54125e190d25b6619c4c5cdee3f1028a856a4e4e4a8d1c

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