Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e22779d3cb8d66…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 14:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52ff9954045b74ddb0d93bbf745409db SHA-1: 9395d130c066300e54452e829bb68f701eb55cf2 SHA-256: 27e22779d3cb8d664e4b5797343035b581f8d58ce92a58341abd9f61a6c76e7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan threat by ClamAV. The document contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=how+do+i+hack+someone PDF link annotation
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/12584290528.pdfIn PDF document text
    • http://nscenter.cn/upload/files/fozazikuwufepopekiz.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/tewofomatibopa.pdfIn PDF document text
    • https://salwangurugram.com/files/gepoxurafekageze.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/worexatofizizeliwuzudab.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/514023923.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/993889840.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/zenigubapet.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/48166b09f2013c267e4d877090f5a93e/32512669734.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/kuferalonajok.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/86290644220.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/58030166736.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/xedubozapiruxaj.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/20527374772.pdfIn PDF document text
    • https://hgb.se/filer/file/13242318949.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/rekekisoje.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4b8e0ca5---69487443818.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/litavo.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/12515200469.pdfIn PDF document text
    • http://telecycling.info/files/file/76372500094.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/93002205525.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/14614168634.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/60865672350.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/kinovutemuvevixanovusodi.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/52151268718.pdfIn PDF document text
    • http://yjccnc.com/upload/files/97204995842.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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 16300 bytes
SHA-256: 40c20af4c1fd207f88a90dab5652efc44f56783313daa5f5061bb4e69bc7db5c
font_01_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBA 10560 bytes
SHA-256: bb2802834351f3d22155d97d5031b2ff9eb46bb8ea871dff48cad3580043d220