Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3de1ccc7ba6739…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 11:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6bb82c4171bf5190e3c9b6e95fe7e4a3 SHA-1: 1a6b7f803ac6f45778c7df4c1154228ebcbfd8d5 SHA-256: ff3de1ccc7ba6739a7ad2ee063177b4c4f83d5ab13ce80b4020730559abe7832
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to various domains, suggesting an attempt to redirect users to potentially harmful content. While no scripts were directly extracted, the nature of the link farm and the ML detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://france-ex.com/images/blog/file/barusiwegozo.pdf In PDF document text
    • https://bcm.es/files/galeria/files/5833582679.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/rigibonasubamizedewinezu.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/kinopapatenekazimax.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/81068254117.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/80588367715.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/6774181029.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/9522852672.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/povasukimodag.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/69544200696.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413f7256ed6---jepasixakonavevajowasudur.pdfIn PDF document text
    • http://irths.com/upload_files/files/xokilarazuzisojexe.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/sunowifiwakalazemokedisul.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/70349029657.pdfIn PDF document text
    • http://twilaw.com/files/files/bogigeregasirakelud.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/dagezifijivozuduluwu.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/59072828514.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/tabepibisurujoxizavoze.pdfIn PDF document text
    • https://hoavily.com/uploads/files/3954389462.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/fovapunotenizajegejom.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411d512cb1a---nufilowuzusenubitox.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/87577011910.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/bofuzajepapodezuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=harmonium+real+sound+app+downloadPDF 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_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 17408 bytes
SHA-256: e4c2d101e9ad36a58caf6f09b620ddd97acb1b7f69590ae3b8a55fdf817afd3b
font_01_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 10632 bytes
SHA-256: 359529b128cc2c68b555f98384dc8f5b0557691fad4dfbd535994a59f6a1274b