Malicious PDF — malware analysis report

Static analysis result for SHA-256 841c0d4eb1a0f4eb…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 21:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01d8d2eb494dedc1457c96ecf72c5801 SHA-1: 4b2e8ae5585eed6eab34add4b443433527011d31 SHA-256: 841c0d4eb1a0f4eb9d0550d80a36f1e1040909b0f5f77b8f272d98ed1b718084
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 of which point to disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to lure victims to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=where+to+find+widgets+on+android PDF link annotation
    • http://studiogiamberardino.it/userfiles/files/71977409363.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/5234495700.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/59690711509.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/16955748776.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/jororonizumukipovu.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/mizagebebo.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/64069042871.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/rerafelanubin.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/vafavaxisedazudukav.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/16765263331.pdfIn PDF document text
    • https://kokomanis.com/contents/files/vutujajaku.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210904042556.pdfIn PDF document text
    • https://medpressa.ru/files/file/26609525334.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/zazanizugem.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/57792542637.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16144e3904d1a5---64608331447.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/poniz.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/57501815787.pdfIn PDF document text
    • https://rjpexport.com/files/34841697233.pdfIn PDF document text
    • http://abc-tel.ru/data/File/8541260726.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ef8ead80318d8f8af2978eea04b8e5a5/nobisudafunakolozosawa.pdfIn PDF document text
    • http://vln.nl/files/file/fodosijigepobusulimepa.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/natonozonikarobatowa.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/gikexugaxamusutatesojitar.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_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 17104 bytes
SHA-256: 7d9ca86b6e74e5e93c3829ea21651691b48dc4d892561e049390aa0ee46317f3
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 10668 bytes
SHA-256: 082a2c30d062f682b80889e7aa9a71dc266d0810a393a999b1b76b8cace5d3fb

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