Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f99df6430ac1367…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 02:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9c5111ba965a1e711affc187c416535 SHA-1: ad3998ac2b688eb6d05f8a1074f4c9b1edded8b6 SHA-256: 8f99df6430ac136703d851597e5b07b1cc8637afa586ccc01b5ed48cc5613716
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs pointing to potentially malicious domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=catmouse+for+android PDF link annotation
    • http://indianspringhomes.net/userfiles/files/kemokinaduwizotapezevir.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/66225484154.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146d67fadec9---78575606675.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/munobelubefetiwisabobuti.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/bekemuk.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/figaxudusugup.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/56260482927.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/24949545719.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/68952537568.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/27394488847.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/birawadutemawi.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/70533566072.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/46579300233.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/womitexefufebejorej.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/riburidomebuv.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/sekasut.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mebepoguwusodenawoliditu.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/kavar.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/letewavobelewudagowiviniv.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/xofexexapokanobalosa.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/rugenose.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021092113525173499.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/6440709438.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_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 17296 bytes
SHA-256: f8d8b029c02979cc8b0df3fff2407dc97a41485382951245fffb8dc758816967
font_01_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC3 10600 bytes
SHA-256: da5489eebaa788cc1f7e2e5fbc0c3acaf5891f7cdd9478671ba01667c95e0604

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