Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c4b673d126cbf3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 22:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba2a755413b9d45af580edf49d6efbd0 SHA-1: 4009c9e7121dbd4bee71caa17856377f8c7025df SHA-256: a3c4b673d126cbf393ed1d5133fed6af2d4457d49b1ab27042cff6a1147182d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to potentially malicious PDF files hosted on disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of disposable hosting for multiple links.

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 http://ladna.pl/user_images/file/69219344732.pdf In PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/17409902139.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/weratelo.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/9ac6ed48826e43c76db4b04fc05acd7b/36028575993.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/zavepadofijupumulonel.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/bazisomadevepemib.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/62086562883.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/64320077723.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/goxidusakutajim.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/lagevobirekodujiw.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210902135431.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/89379039cd6e94f2bfb2993b82195595/38632474245.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/vuxaset.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/33661433089.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/29959797703.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/39488925053.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/51800660257.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/99136024729.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/mowekifo.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210902143723.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/ponovegetutefa.pdfIn PDF document text
    • https://areicon.com/images/file/96193173771.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/vuruporanabu.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/jogudeguwozolowatej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=my+hero+academia+season+1+onlinePDF link annotation
    • 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_off0000d17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 10696 bytes
SHA-256: a8d2854dce8f0f7ee51635971aff7800cc177f383af3ee05b9b9232016f7cf65
font_01_sfnt_off0000e9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 19512 bytes
SHA-256: 3cb3364bc125e05413e440aaf1a2ab19ff5010327ced04ec2641ecf629de808e
font_02_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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