Malicious PDF — malware analysis report

Static analysis result for SHA-256 797163da592e8206…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 14:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97d7478d47c07e2a0a6ff1b61c0e95be SHA-1: 8bc345d2e909a1a2c41c0ba318bea3b6abc0f081 SHA-256: 797163da592e8206c7192e214121486f97fd5da8170708238c3b38e0b2c773af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of multiple unknown URLs points to a potential redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://helices-evra.com/userfiles/file/pozikurasugo.pdf In PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/13228462945.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/93803359800.pdfIn PDF document text
    • https://inarsindbari.org/uploads/76655234250.pdfIn PDF document text
    • http://workontext.ru/media/file/33233258250.pdfIn PDF document text
    • http://billsky.ee/files/file/bajabadat.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210906_86857CAA8A8311B6.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310d94f00b3---50517914273.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/63275134114.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/wemopumajesopisazisufas.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/modokedokodifugofeludem.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/nafumijovitamomodek.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/18297069803.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/vivizib.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/88702074812.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/64675548079.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/gufox.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/disixejekofewefumivuji.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/4395291455.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/gumapufuluxabiped.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/6420255949.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/pevatusirafufukevolag.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/laroxojoruje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=lyrical+photo+status+apk+without+watermarkPDF 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_off0000d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 19368 bytes
SHA-256: 2d40e04486c50f8f314d617302823657958ed813c041f2af862b7186a40c64a0
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 10884 bytes
SHA-256: ddc559a4442aeafe2e9e17afb7af8c204569a50428c900bd484be7ceba47ebb8

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