Malicious PDF — malware analysis report

Static analysis result for SHA-256 a286685f477b17a3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 04:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d92ca66bdb7be8fa92e31627241a65d4 SHA-1: ed5e039fbbd215ad067ec4a270c821330e0de7db SHA-256: a286685f477b17a37c676ab1730044b711731d8ecf031f0f019c6bdbb7512df9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggest malicious intent. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://philabc.ru/uplcv?utm_term=download+plants+vs+zombies+android PDF link annotation
    • http://sarljarry.com/userfiles/file/47842324180.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/buvavoloxamugunazi.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/27021609535.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/zipemojafurabo.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/74777499655.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/24647935630.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/50253162854.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090609035783.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5vt2berqqcojk6qpnokvgsbkp0/woronat.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/riwilar.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/96992976424.pdfIn PDF document text
    • http://posuni.com/userfiles/file/1625769119.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/32877311687.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/luwuvekogapufeboko.pdfIn PDF document text
    • http://df-2.de/images/daten/file/bugikifo.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/11592601441.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/46651268748.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/bokufiruvuziwomanajifuf.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/zakajavifasewamedab.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a4c51d3e---semanarixilodopisibim.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/40933657741.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/wimikewezuj.pdfIn PDF document text
    • https://svltv.in/userfiles/files/58403523759.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/21867958759.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/zexutol.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/42162330701.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_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 17820 bytes
SHA-256: f959ef677ec7a1e1ffb38a006d454133b4cbbf5145d29ead18d37053ec179db0
font_01_sfnt_off00011349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11349 10904 bytes
SHA-256: 297d23824ef535d80d494448feb5e668fcdab32d9be8521b2c960aa9b2c6c93f
font_02_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1