Malicious PDF — malware analysis report

Static analysis result for SHA-256 c941e212ef1952a5…

MALICIOUS

PDF

81.4 KB Created: 2021-10-07 16:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 91d8a868d26524b79a9dd0c7d64ef590 SHA-1: e0380afe3487e05f624fad4be0ae1d5537a6658a SHA-256: c941e212ef1952a58b9ea271c1fe8de60173e64f0715ae33ee38c24fec8baebb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, strongly indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=apes+practice+test PDF link annotation
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/14976832229.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/29629168128.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/97966674581.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/30352953954.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/14431059700.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/19136679294.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/45202571753.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/sukusoverovegefiramebas.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/fomokinokenezuxu.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/gojakokefixifaxi.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/xitepeg.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/983b35938c06715b2f4a111e57bdb769/luzuwogig.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/zaxilivomabiwulefisesal.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/34545812479.pdfIn PDF document text
    • http://mgrima.com/files/file/19713271282.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/5792216828.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/gifabojotup.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/vipigiwadi.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210910095314032.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/tulerajiviluzuxada.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/62244929338.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/39937985483.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/jipofudadetajewinav.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/37f614d39a7405d630f535cd9fa9ca64/jobulopenexafobefafivadi.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_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 19984 bytes
SHA-256: 62b81441f4f09168a35bd04159f01695eb6129dbd1dde1424fe53f6d22f84134
font_01_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 10076 bytes
SHA-256: 61a019db5e08956331d268d860de8ee8578e4c8a6b0cb933e33fbda37c090fd7
font_02_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1