Malicious PDF — malware analysis report

Static analysis result for SHA-256 54761c750a5cec8b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 23:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3676efd72828661066a5e94e03c75481 SHA-1: e231e4d17478367fe11c19be137a5dc3d5439b27 SHA-256: 54761c750a5cec8b6b5e5747b7b4a974b5c64f54da569ccb0ef27184fb33f52f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://pokebarslo.com/uploads/files/sivamefevonenilufifojuve.pdf In PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/siziridunafuwezoxizug.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/82141795651.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/nudevepani.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132ef3a91753---49016898598.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/kexazamorolasiniviz.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/76357936895.pdfIn PDF document text
    • http://ranchobg.com/img/file/39038647001.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/51591336882.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/xinasiribiwu.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/50377285659.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/64778972202.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/dojugod.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/zovozodafagukixulodewem.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161392b55c40e2---xorovovojimi.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/fitawa.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/tevoloruguzavosepogawofe.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021921398565.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/78290282351.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/kuzezegafamawewe.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/77001824264.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/wagokudopaxeregetaso.pdfIn PDF document text
    • https://renewone.de/files/kupizetanaz.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/73791380730.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/58925607478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=free+sip+client+androidPDF link annotation
    • http://irodori.kir.jp/files/file/bipuxelabi.pdfIn PDF document text
    • 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_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 17404 bytes
SHA-256: 70f83196843105f35bf21a41a5746428119799938094acf98179b18cd3a378e8
font_01_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 10484 bytes
SHA-256: f16253de3b468c46e11ba8c269090ee8044bc27edc05573033ecc91bdd807297
font_02_sfnt_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1