Malicious PDF — malware analysis report

Static analysis result for SHA-256 a415d654e8d97584…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 10:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5e3ab28a9cb36e7fd16134f79817e340 SHA-1: 06e5fe7cd2ee98ca650ef128f9a58183171b1e22 SHA-256: a415d654e8d97584ddd01c2c62506dc248cfc0ba1733763f1339e65b82c3985e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, one of which is a link farm designed to redirect users. The presence of 'apk fortnite installer' in a URL suggests a lure for users seeking game-related software, which is a common phishing tactic. Although no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/todefubomifobavepodefu.pdf In PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/kaxodukejoba.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/98405084654.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/tosuxodoxarizukodimafo.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/buxopajore.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/xirilafuwotavi.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/kimasupi.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/98404003811.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/lerufonexo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138422ca7075---rokevitofaxekatepulelura.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/najazitabuxerawin.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/bomivaji.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210902055939_b87wio.pdfIn PDF document text
    • http://wdnederland.nl/file/zikofukab.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/19901007391.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/xiletevuvudu.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/90690669626.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/dafasoxagixawenalelonag.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/56073825245.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/41518811969.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/nazegegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=apk+fortnite+installerPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB4 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_01_sfnt_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 21560 bytes
SHA-256: 918ae1d47fb5ec45e5ad682be5cd0c219f3913bb6eeff982e03c06d4f060ffeb
font_03_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd
font_04_sfnt_off00013bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF7 10424 bytes
SHA-256: b50f1da2203ee42fa4af38d1131718dab6f79c94c586e7181ef15af767b83841