Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea43143bb3a56e14…

MALICIOUS

PDF

82.5 KB Created: 2021-10-09 14:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f1e7d9f029b1c57a6fed4c1611b229a6 SHA-1: e8f10fd407664fd40a82ab62ed559f892032b5d2 SHA-256: ea43143bb3a56e1452bfbb400ffd5288b7df26f71c294d7a89f5c11cc1201742
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=camuy+river+cave+park PDF link annotation
    • http://retrievers.su/ckfinder/userfiles/files/2698355133.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/9184437978.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/rofuvisiravefavalarim.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13586326775.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/diwepamuwasuvifuton.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/wetiliz.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/xazepubix.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/64851378153.pdfIn PDF document text
    • http://letdentalab.com/img/files/38617903427.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/sejajozover.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/29151737983.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/japuvoja.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/28797167984.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/redeguvalebozubalemurigal.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/bevumevunuvuzuli.pdfIn PDF document text
    • http://sdds.be/userfiles/file/wetoxufapafin.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/newetisogeli.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/bofenanuxigefonewabe.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/2493444531.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/45112396856.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/85617192247.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/19626815939.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/9771534013.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_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 18856 bytes
SHA-256: 8eecb085f89271e693767fb7aab35472af8db7870fb14a1afe9c1a46ea3d4cf8
font_01_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 10404 bytes
SHA-256: 6d11103da9554c3a3d2d499ae7ff581647a6dadd126b4bcb9d8441f8dcb9f655
font_02_sfnt_off000124d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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