Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd42be595a837d75…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 21:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31e306d3cd2d260a837bbeb7f2cb8f4e SHA-1: b83e9379d9795cd02055e1c23881080c4eef73a0 SHA-256: fd42be595a837d75ca02b103582b306775d6726a42264ef6a9c7c4ed1fcb57aa
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. It contains numerous embedded URLs, many of which are part of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute malicious links across many domains, potentially for SEO poisoning or to evade detection. The presence of external URIs and the overall structure suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://dcoderesearch.com/uploads/65344837870.pdf In PDF document text
    • http://megalabsrl.it/userfiles/files/25911634830.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/lexopabomiripu.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/xizetofomujuj.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/raxujovodijenovevutekegu.pdfIn PDF document text
    • https://servicepapik.ro/files/xadizal.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/73050712521.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/711789970.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/50545101404.pdfIn PDF document text
    • http://aimic.com/userfiles/file/ginujokikumosojuji.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/37753957218.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/lawapimiki.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6996550350044b9a073ce5ff588dac18/bimevexemo.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/sinefexutabimimisok.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/rediri.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/fenogigo.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/kajamaleloxuxepomevawa.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/xovewokexixujudise.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/totoxolixuzur.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/silujovilituta.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/81713135519.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/wilasiladomesozejigav.pdfIn PDF document text
    • https://taperagi.com/contents/files/makarigowodafamolefewezon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+game+evil+nunPDF 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_off0000c2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 10476 bytes
SHA-256: e3202f13e1e9d46337490683c533831b5a0e474dc7b0b6a515d1da44fdb9a126
font_02_sfnt_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 17420 bytes
SHA-256: 4d1659ab287f8bbfbbd1b6778bcee4564e35ddea157a049bea3fbe9fe1703217