Malicious PDF — malware analysis report

Static analysis result for SHA-256 810da994ea4d4817…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 04:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6617f633558ad2719a860b8e5be90f99 SHA-1: a09a6419041d1ae36eb72c17c56b70d2649e451b SHA-256: 810da994ea4d4817e4da5c4a2c66be4f403d92d65751fab97a591ef3338a52ff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The embedded JavaScript stream, combined with the ClamAV detection of 'Pdf.Phishing.Trojan', strongly suggests malicious intent. The primary attack pattern involves directing users to external 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://chcial.ru/uplcv?utm_term=download+launcher+buzz PDF link annotation
    • https://acconpriti.com/ckfinder/userfiles/files/49653224871.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/88044628460.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/talud.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614664485e798---8378717908.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/78487176653.pdfIn PDF document text
    • http://bankerz.in/qpic/files/67789769886.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/bedetuzoseme.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/67923178520.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/najunejadamanutogumifuki.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/sivoxemupezanegevasu.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/zubojodalitife.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/12698908897.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/94102252328.pdfIn PDF document text
    • https://huanghecables.com/d/files/seburifopomakexe.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/rugozofatunu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/ronagadasufikobo.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/lakazi.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/magabebuninal.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/dapivoluravezo.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/25523486632.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/17318887307.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/juragiwodegalimu.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/56909215649.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/37652706706.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/50999346535.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_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 10496 bytes
SHA-256: d50ee4d9fa08c97477bf6ac15009669dc8dcc2fed5b56d30da442b683f882a16
font_01_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 17908 bytes
SHA-256: 670cb75769d60a71b5c34230dbcb3010357e5a17b0d91d35c2a147e268eb0b92
font_02_sfnt_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1