Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84373d66e842696…

MALICIOUS

PDF

77.2 KB Created: 2021-09-15 12:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92a2f9baae415347c31341ace2610bc0 SHA-1: 1e5218c6c1090a71a8fc3fbc3c9b6cdfb2a9706c SHA-256: e84373d66e84269693315425ba1d2ce11d4c90fc661a09a21faa25da8322b358
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and forming a link farm, suggests a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of a link farm on disposable hosting, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ticketsperiodico.com/galeria/files/xejaxasituxenalivopule.pdf In PDF document text
    • https://big-affaires.com/img/pics/files/18692052156.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6ee0daa666e748c22dbb9b67b3e745a8/zabatepesok.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/momesaxagapuwepelip.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/wubibisu.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/rasirijufudimifivude.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/76150348611.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/rugeso.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/xadobujuvikoli.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/60008922893.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/zegobobonakevomipofubonuf.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/915194266.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/dobokumebi.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1614047515388a---rofowijibivikeru.pdfIn PDF document text
    • http://www.pvvc.cz/files/kunesosow.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/vobojexezegatomiwurepeve.pdfIn PDF document text
    • https://kham.vn/userfiles/file/12972615904.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/55067065458.pdfIn PDF document text
    • http://mayjack.com/upload/files/10920661979.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/39354006364.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109130447483274.pdfIn PDF document text
    • http://lscapital.it/images/file/vilabosaluzigikaw.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/talut.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/tudawelaworipeseduwamif.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/93347183347.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/bodizuxu.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109122356473959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=download+assassin+creed+for+ppssppPDF 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_off0000c860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC860 17824 bytes
SHA-256: aaacf6a8e09a7277a9905edb775330238a38200b169b03d2ac4c79c849aec7a3
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 10604 bytes
SHA-256: c1a08f6961d5b2386f1e98741a096f2cce7bae3c5a1c0886ae7c814c14ab39c4