Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bb4e2303955a3e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 13:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 42256d9666bcec379806a3b6bb4dbb22 SHA-1: c2f0e0f0c6e19bc69e8065992aecc2a63d82530f SHA-256: f3bb4e2303955a3edf991f9e1b427cd6d0268978de6167425a58ca3db169765c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://prolocolidodisavio.org/ckfinder/userfiles/files/45045751266.pdf In PDF document text
    • http://dezis.ru/uploads/files/javalazudog.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/puwesavixezafituliw.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/78704834970.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qt5m85cnfpn0urnk6pu1mot4s1/84073986372.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/70019851238.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/befamutulididewi.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/20850088008.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/biguzeganumiwolijixomu.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/29706428363.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/16431435026.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/88916772917.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/67444161817.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210901115118.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210902175907.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c10d98f33c55c9d4cba097bb29cc38c4/8201741750.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/suniwo.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/litapedugivozizuto.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://dtmaso.com/public_html/Imagens/file/kejon.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/59712396592.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/67527653450.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/26598463924.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/xukejesawixo.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/bezevavifuxanesote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=new+bhojpuri+movie+download+2020PDF 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_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 11132 bytes
SHA-256: 85258a575cd314782aca5a6653abb0d315395fbde16a6099dd2731b43b042d73
font_02_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 17792 bytes
SHA-256: 3172093e71be8d2d27cd1b658296b77782f3a1771bb32cdb95037e671b3d5f16