Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30e58f868efc79c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 04:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6685395132cbf4b94fcb533f36c23ef SHA-1: 60f845d65f1644dd7dc54077f40071c899ceb07a SHA-256: b30e58f868efc79c1b98f289de93736cb5992d07834eb43bc6a92af22cdd0fe5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=euro+truck+driver+2018+apk+mod PDF link annotation
    • https://ispartaprefabrik.com/ckfinder/upload/files/59069998089.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/nedowobe.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/17591755473.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/larudigal.pdfIn PDF document text
    • http://chipgene.com/image/files/20210916_104651.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/meranuwiponulaw.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/50477508294.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/64931849434.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/14933339336135ba10a34e2.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/vinudakaminisulesel.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9469a6a61---seximi.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/todobomuzebugunegenopafa.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/64081497343.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/tuweviwabixobeperona.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/berano.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/diretanejuwipagesaponu.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/duduzuzejujejo.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/86937212757.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/mebofirubisi.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/46880857168.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161353e42f3166---84573537424.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/penokajepaparobu.pdfIn PDF document text
    • http://packturf.fr/files/48060066685.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/43522884704.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xubikubumiv.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_off0000d284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD284 11100 bytes
SHA-256: f68cea35a6affeffcf36e81eca8b500519dbc7ce56b19fe99a6d4fcd9281735f
font_01_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 19700 bytes
SHA-256: f202aa35cfc8302a713c440d598ebacf368cc59206d919f65c97b117d4d28efe
font_02_sfnt_off00012050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1