Malicious PDF — malware analysis report

Static analysis result for SHA-256 973cd392f6b316de…

MALICIOUS

PDF

77.7 KB Created: 2021-09-10 04:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bf43a0f52b9e097de4613bad9c2fe11 SHA-1: d77900611135f9786f9c104a1e146b5dd14a5481 SHA-256: 973cd392f6b316de1f771d13baa6bae2e9e08d60f2f312ddc1207be5d49537e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs and is identified as a link farm, suggesting it's used 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 campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://iaestedresden.de/userfiles/file/35217875074.pdf In PDF document text
    • http://lawfirm.vn/MINH/user_files/file/rariziwilumopapupakubuxev.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/51386293418.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/15879869765.pdfIn PDF document text
    • http://prosquash.by/data/duwuzimomojuzim.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/setisaduze.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/vadebipofut.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/32674486495.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/kelojega.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369cc5ee104---xonuvijivamif.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/1989928200.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/57501815787.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/fubola.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210908130753.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0b592552---66254046307.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/47560727505.pdfIn PDF document text
    • http://cartopack.be/Images/file/81949971559.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/tupafureteranusove.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/55203685547.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210905092035.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/wisasisevonotafowokadi.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/35578915651.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631160107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+skin+idbs+bus+simulatorPDF 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_off0000c447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC447 20648 bytes
SHA-256: 862870504b5e06bf41070d6143f5c3e5fe95aec64377c24da71e5df8c2051245
font_01_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 10696 bytes
SHA-256: 512f66d7a65c46556e53985f5cbe7ac6eaa86df3279767c9aee7c770396796e9

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