Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d388c06dee699cb…

MALICIOUS

PDF

77.6 KB Created: 2021-09-15 00:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c32e156804c273bea11340155982b8b SHA-1: 66d7d4e2520a41064130e3e53352910aea914175 SHA-256: 2d388c06dee699cbcfd3ad2554875dae16878c234f3c29dcb12282bc13f157fd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the linked sites are part of a network designed to host various files, likely malware. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=candy+crush+mod+apk+unlimited+gold+download PDF link annotation
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/xuvakubekexodevi.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/29337423201.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7d7413a1---nivofopuwaxagokidilini.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/murojuguperorevolulexunu.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021911852464542.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/sefogasafaboma.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/mokonatuwenabixug.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/24333945817.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/26996288139.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff6c8c6f73---85752395008.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/81152638281.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/kogomanim.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/99529065615.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/46127126000.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/vamusomogewagegol.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/kegaxu.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/vekunikep.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/wiwebadevefevojugig.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210913205740889506485cay.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/mibinesobafaxetimisis.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/surinoloruleludepafu.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_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 11384 bytes
SHA-256: 2163e06307220e52fc55820c0687512d90ecb4ea593525fb4301f918d7926a28
font_02_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 17812 bytes
SHA-256: b65460da2ff2e420a41c41983a5206d82a9f44a77e44bd66c134c0040c6897fe

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