Malicious PDF — malware analysis report

Static analysis result for SHA-256 6564e068007a100f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 04:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 882d8d66bd2c65078ce23660a11209d3 SHA-1: 1b244e09a3ffc3954899f5c6a1d7081cef125841 SHA-256: 6564e068007a100fca55e5dde0a9e7dffee9ec75d4a70554dbb27a38dd907d3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are embedded within the PDF structure, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the use of disposable hosting and UTM parameters, common in phishing campaigns. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=all+2k20+locker+codes PDF link annotation
    • http://adbrf.com/files/fckeditor/file/606488836613f41e8bfded.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/pujematolemogarawojez.pdfIn PDF document text
    • https://eravikulamnationalpark.org/ckfinder/userfiles/files/worijuwaziworatubufiwo.pdfIn PDF document text
    • http://www.og2c.com/images/file/domixevutidevom.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/52404799481.pdfIn PDF document text
    • https://masihpt1.com/contents/files/xorobalifigezokudebide.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///zalivov.pdfIn PDF document text
    • https://mar3ol.com/Files/files/pepigewifosurabolezunobem.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/69638015206.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/zibawiraniris.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/39890209699.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614992993c8c3---belepututipafidiwazegu.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/12138853649.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/bobuxeworira.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/92980394229.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/lejeniri.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/mizel.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/wakususiso.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/lezakamuwuzonimofewebo.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/dotapogeketojonawezevavur.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/kawova.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/81508452843.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/73536819191.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5fd76678---ruworajigidawajodupaz.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_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 19632 bytes
SHA-256: da98feea29c466642fd79f1daabb1c84b047ebc5078a75bda53f10a1d79dc7e8
font_02_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 10220 bytes
SHA-256: 2ad4dad5d9b922aa86f5e81c7fc1e8a3ce0638f3291ac728517b90eda0d9d47b