Malicious PDF — malware analysis report

Static analysis result for SHA-256 85574ecba67b1d5a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-16 06:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a78f11b88db5ee930c3a7ab8c656dc53 SHA-1: 2c901f660339fcde2e4c45861c899f34dffc49dd SHA-256: 85574ecba67b1d5a16fc4244eee84f4a6b0d3a193814d8833c66a01775b9d0d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely intended to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=pulimurugan+mp3+song+download PDF link annotation
    • https://paklya.su/design/img/upload/file/95319373622.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613061d597cbc---gobev.pdfIn PDF document text
    • http://iccarrentals.com/files/file/29206743974.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/zudurowebufokifelinonuj.pdfIn PDF document text
    • https://il-gusto.com/images/file/fabixepejem.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/41426502483.pdfIn PDF document text
    • http://livestocktool.com/d/files/17897823905.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/kejumisofo.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/kokoluwodusozumojadeko.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/42039902011.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/38863247843.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/zidafixozanurodetif.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/nepakopinojetosil.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/61758841127.pdfIn PDF document text
    • http://coffee33.ru/archive/file/xofawivilufedanisilefaxu.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/tilamezunokarejawobiz.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210903183628_1937062565.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/10357277305.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/31738126336.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/6528983027.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/63771352106.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/82884650621.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/romem.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/92412943691.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_off0000b7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AA 15884 bytes
SHA-256: b7c3d8a2e9bddf551af33075a46a0e1eb8947f1433b6048f9678487a828c0ff1
font_01_sfnt_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 10864 bytes
SHA-256: 67cebd361ab399410e87d6d7b8cf2c5a276d6fdc341415bbb4fc237e8d5d0c36
font_02_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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