Malicious PDF — malware analysis report

Static analysis result for SHA-256 514ab47aec1c2a50…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 10:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8699bb5f9c65c4ab0cc21b30fc563c3 SHA-1: 52e96e3f94fae7548e93462f1ac44c0cf5ceedce SHA-256: 514ab47aec1c2a50a1990bef3302ca1605610bc6fcc6db8bfe30e8b8e6e7b15a
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a pattern of link farming on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=periodic+table+with+properties+pdf PDF link annotation
    • http://agt.es/files/galeria2/files/44981095153.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/wigesemujusokatosirodav.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/47740187942.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/duvewusa.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/wolirenogored.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/66070881818.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/kebilafumusekutim.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/32973071235.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/92687853524.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/xededokumabolajosamolana.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nimek.pdfIn PDF document text
    • https://granitnet.hu/editor_up/19787180814.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/17524286658.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/nigogisozawegojevore.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/47360569615.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/fanivofanav.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/panidif.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109020350124308.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/71160219207.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/lodunula.pdfIn PDF document text
    • https://hotelcorona.ro/files/lukejujulabuvanebozekem.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/bizopi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139232bc7475---24822954116.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/tiworojo.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/64694963854.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_off0000c2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 10840 bytes
SHA-256: 904c722f5a3038932434dcce721e8fd4de3bd5cfe484cdc109af9a078b94e333
font_02_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 17264 bytes
SHA-256: daddb4e95d701591c884c4af89493f1e0565b910cfca3b3eb7d21292eedeac73