Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6fc8b07cdb49019…

MALICIOUS

PDF

71.8 KB Created: 2021-09-24 23:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 139fc5d256947ad974d308a68d394d27 SHA-1: 4c234d8ff9dd9101d7865c851b956ce59428ed39 SHA-256: e6fc8b07cdb49019460cbf085565eab77190866e2b7a9cb1de8f51b800995a36
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to suspicious domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436970163ae---jaweguwijiso.pdf In PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/98427507128.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/61913199410.pdfIn PDF document text
    • https://onecre.com/images/content/files/82770793706.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/68185702356.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/42468046473.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/jezipoduzogapukubigo.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/82531878938.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/86707009829.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/xewojezexezizugeleguz.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/vusepevefoxusijuzigaf.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/lewixagavirosuri.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/93184436790.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vawafuwemabexok.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/nuwavijiwuradotilugiru.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/woborufugojewoselebi.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/zaroz.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0b206f6f---7523620477.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/67003214876.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210912091236.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/49055383595.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/44846956041.pdfIn PDF document text
    • https://led7.ru/file/27270525054.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/befasubisuwumurupebudezet.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/zaxawavagurezivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+change+up+full+movie+downloadPDF 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_off0000b65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65F 10916 bytes
SHA-256: c36b7ff04e64500de7dc0ce608e5d488b5f5d53b66783c4cb3610e9c8e646f2a
font_01_sfnt_off0000cf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 16364 bytes
SHA-256: 1d753421cb1506b9da366008d64c289aa7ac3de80861c39858e509c47cb34324