Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b1810f25923eb2…

MALICIOUS

PDF

99.2 KB Created: 2021-09-17 17:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 363e3d5478a6d693642daf12727376f1 SHA-1: c2b9e18e822913fe5e8d481f423993e28907c624 SHA-256: 00b1810f25923eb28fe2348a2a6dc2d4039857126bfafd2f0f9f3f26eb5ac17b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to host malicious content or redirect users to phishing sites. While no scripts were directly extracted, the presence of numerous external URIs and the nature of the heuristics suggest an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://nisahanpin.com/calisma2/files/uploads/digirugewosinemorazezabow.pdf In PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/47223890235.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/67247096517.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/53527595789.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/40813668055.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/67228513949.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/gilujizasitajunom.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/woxesapudizomazadije.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/87745927311.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/wijiratup.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/48809067773.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/35210764872.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/68487026974.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/dididowekoditosodaj.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/pomina.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/perosi.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/vezudamatazu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/39727990681.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210905160322.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m08isup0jsqhl0t9khl75f5hpo/wozataxakixesik.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210911052332.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/28080391546.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/pewawakigutixeji.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/17498241799.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210909_E4AD1651210A96E7.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=love+in+the+time+of+cholera+movie+online+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_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 18780 bytes
SHA-256: fe62c55ea5a0b55022f98d832dd8bb621e1178d97947a3341a996f9d9b5d1b92
font_01_sfnt_off00014f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001678b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1678B 10456 bytes
SHA-256: c65f0f2fc4c9bec181be5e0f86f46bd3e835054b3f790c0481152c463c8da79d