Malicious PDF — malware analysis report

Static analysis result for SHA-256 c814bce523852f42…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 16:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92f356109cfdb11d1abdbef16108f0ca SHA-1: b647bf3002f55e164e2b4db5f1c6f41c61a288bc SHA-256: c814bce523852f42445f525cd3bb108b084eec47e7e0a6ddfda078dd77c74c5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/bogila.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b510b99322---79482183041.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454cd5d6e7d---83932264747.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/nazojimif.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/dusikuzunirivepasef.pdfIn PDF document text
    • https://12tiga.com/contents/files/9845089688.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/jexexotagipol.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/pibosumowolibu.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/56161267434.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/15683048869.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109102056412640.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/nilapomosizutaroselixur.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/75655462553.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/fovuvosuze.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/12670204220.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/rejixirijovopinepudi.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/75346064583.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/21920406468.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/xofodaworij.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/vawukuwufanevemupajukizi.pdfIn PDF document text
    • http://forti.in/userfiles/file/jabigotekugomu.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/rasogaleraxa.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/68126297953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dua+for+my+parents+to+accept+marriagePDF 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_off0000e230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 10992 bytes
SHA-256: 9cf3e1ff66df130c86fed7ecf03f80920e87301381c23be5729a6789505dc789
font_02_sfnt_off000113e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 17760 bytes
SHA-256: 3d04f4a41320c7a640079c77ac340d48337258ea12221df6773cacb11534b40d