Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b5452c10fbeb8d…

MALICIOUS

PDF

87.6 KB Created: 2021-10-10 06:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a8b2bff5007da3b589d50183d90769a1 SHA-1: ea3afcb0b3c8a8e17074c6c00fff7be2ed51bcca SHA-256: a4b5452c10fbeb8d3f96e94b91b14e08a88ab514234b1d43b966c7d3f4168205
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=comparison+between+cisc+and+risc PDF link annotation
    • http://movietek.vn/hinh-anh/files/85023026513.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/499066050.pdfIn PDF document text
    • http://freestyler.cz/img/file/remesubiwunowodemaz.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab8e1576d966d851394a35993d5f465b/81616791203.pdfIn PDF document text
    • https://chilepools.com/contents/files/81471821934.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/wekebop.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/wavozum.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/96914437923.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/tikezoselef.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/16082657352.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/bijuvasaxoxoxuzegov.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/medekusedubexe.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/77022708855.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/gupupuvaruj.pdfIn PDF document text
    • http://jadeite.ru/images/file/gedexopexixava.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/71758834559.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/47825312760.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/15247237834.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/pumuxakefipubapadagip.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/74936653113.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/wagavetewexuravisiv.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/28517446249.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/76755751995.pdfIn PDF document text
    • http://gdgom.com/upload/file/211001120106677152gvx5u6v5kst6.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_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 10884 bytes
SHA-256: 2b31551f16a6197b55915f896d2dc003d523c5aade82e410ff095ce9ab8d5c86
font_02_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 19352 bytes
SHA-256: 92b240684e21b69b0b6ad17ca5f4f01aaea64fbaa807e6e3e55b5eb6a29f8eb3

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