Malicious PDF — malware analysis report

Static analysis result for SHA-256 24670241af2d03de…

MALICIOUS

PDF

81.0 KB Created: 2021-10-10 00:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a1a80f84bdf4383f33cb13819cd6f87 SHA-1: 015b817b31d51924d806766e84e430e60f2f48b9 SHA-256: 24670241af2d03de6dd275d85ea5e8bd89ebaca994561e4e5d0882c7e0f9adf6
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable hosting and containing UTM parameters, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics strongly implies malicious intent through redirection to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=javascript+interview+questions+and+answers+for+experienced+in+php PDF link annotation
    • https://onlinendttraining.com/files/pewofas.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/wevakemenutodijaxoraxoja.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/bafamanipuwikegevol.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/6070970719.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/28461343509.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/4drv4vs9bhk8m2q9go0at9ja34/10562280678.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/82538989480.pdfIn PDF document text
    • http://korytnica.net/data/files/36686939245.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/gireji.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///vutexukasaxabubukaxigur.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/vezagalawanoxol.pdfIn PDF document text
    • http://bscartridge.com/pic/xafuzesam.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/42330314972.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/20027354585.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/ramizolelanavuriditesuw.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/22341076753.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/vufoxolukemopafavikasi.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/gobavugewade.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/90207120169.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/wakomevi.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/fikomojino.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/6747189942.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_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 17668 bytes
SHA-256: 774ed4a45abb7e310dab71ae0765ef41a52bb5f881589e20cfc48c8f6b155c6b
font_02_sfnt_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 11160 bytes
SHA-256: 4a6887a4a920cb9d1748d9e4b39ae1d69f84911b7c92f9ba3701fdf8ea6e176a

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