Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd57e62a7fd942b8…

MALICIOUS

PDF

76.3 KB Created: 2021-09-10 11:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 705013301ff297b33f3f0fa3d075d7a6 SHA-1: e820794a0c10f41cc3e57b57f25744f0382eb525 SHA-256: fd57e62a7fd942b8a04958bee5f4d2af8af32d32a517db1e0ad6169acb53f8ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for redirecting the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/8c0gqmlgr2ted9hglfrimeoh31/55045548094.pdf In PDF document text
    • https://virtrade.gr/userfiles_lybo/file/sazug.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/83192394926.pdfIn PDF document text
    • http://myslizdrave.com/soubory/72609380497.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/72674822059.pdfIn PDF document text
    • http://www.toptehnik.si/images/rafobi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f41a6750ca---29476077816.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/dodudanurunojorapu.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/garubunoxijafapebufavi.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/72549032760.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/jodisekubirixotejaw.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/gidolitawononel.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/namigetub.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/nagipimofarokigugivojus.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/mizudawagesuxugez.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/nesutipujavo.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/88260979153.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210905045739_u1z072.pdfIn PDF document text
    • https://mklaassen.nl/images/file/xefevinomadol.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/jezemevojedosuladebalogin.pdfIn PDF document text
    • https://hssanesteban.cl/files/83861032471.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/ginufo.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/xufilikumagidufejeri.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210910_3BD7960992F9B892.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/rakosuxiwawidigufamivak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=image+music+text+barthes+pdfPDF 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_off0000c1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F6 18452 bytes
SHA-256: ee9bd98ce64feaeea435ae40a0894d0dae8a127890c7a8a4f686b9df95b47da5
font_01_sfnt_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 11088 bytes
SHA-256: f3de66f860330aad25c23eac1b4deb7b0c7060f893b5e88cf8f5817e266d0e05
font_02_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1