Malicious PDF — malware analysis report

Static analysis result for SHA-256 5beef273d273ab09…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 17:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e67db8c5d77430f6956ef6efcde6591e SHA-1: bf92523c9d5ffbf4e6f759bd2a60e9c4d723e893 SHA-256: 5beef273d273ab09d63989fea652b83700a577377cd5e794cc01e3e170f14421
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files, suggesting a phishing or malware distribution scheme. The primary purpose appears to be directing users to a collection of potentially harmful documents hosted across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://xn--49st2et51duvk.com/upload/files/41157905130.pdf In PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87559687336.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/ledabivadelexoxixav.pdfIn PDF document text
    • http://weldingplaza.com/files/file/9153643779.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/batijewerokogizi.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/nuvuduzasakewegekokuvamin.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/80922328498.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/88515133224.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/5074062967.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/26621101663.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210902224625.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/furumasezibezowoturus.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/11473110803.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///55310036426.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/19985778977.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/4657548863.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/butod.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/bofidekinudirodagokotal.pdfIn PDF document text
    • https://ibericadearmerias.com/file/57663799412.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/zilebuwewugovika.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906050152925.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/vosujoterifojerulad.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/pogomivagamapo.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/23111021096.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/zobijono.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/gizodi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613601a573d66---27892078477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=trainspotting+book+pdf+freePDF 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_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 10820 bytes
SHA-256: 4d341ab442344eb437885e6bd1cf67949c3b981cf3d09328d9289fee949c3cd0
font_01_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 17280 bytes
SHA-256: b976ec6073eae430901084d7317acc61b934c1cc4e676e512f5a5ebf96bc6af4