Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e3966d343f71e3…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 09:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7955925290425a752854a78c52919b58 SHA-1: eab143ecdc993bab3c3f80ab70fb3e6065de9109 SHA-256: 21e3966d343f71e3075544aebf815e49057a4fea5a355cdcd5b4db2b1e549726
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.jucadent.es/ckfinder/userfiles/files/jeguvada.pdf In PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/sisatalulasejifazan.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/82973666208.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/segejologajanosavoza.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/gewenurerit.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/lilaxuvelazoluropobizafe.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/50493399546.pdfIn PDF document text
    • http://cutskytools.com/d/files/zenevojivunawelibum.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/39838172023.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/mutefixiroloxik.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/13983747807.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/wadam.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/kafosuvelobojaxopalip.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/55184368302.pdfIn PDF document text
    • http://fruitvita.com/files/files/retenofamigunope.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109250700117611.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/41588595860.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/makosetomam.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/40234445161.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/nazegugomopolapopifi.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/vupuvafuvexijazagizobiw.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/84459517340.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436d5ac8116---60104129718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=shareit+no+adsPDF 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_off0000b3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF2 18348 bytes
SHA-256: 04e2d8a5f50b85145d885f9bbde05a9918309b4c4c9f664035fce8949eefe343
font_02_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10372 bytes
SHA-256: b6f863c575e19e15449fd6cc219f5272b5acedf50592a3a58c1d4a1a7ea840f3

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