Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8da985bea67385…

MALICIOUS

PDF

69.3 KB Created: 2021-09-13 16:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a13894e2563170ac0960b547d370337 SHA-1: 309f4c0bfb5b3ea2d0dc0e835961f37473f42eaf SHA-256: 5d8da985bea67385669fc56124dc24c1a0c20a08c7d2da9c24f3255765446c6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to external domains, suggesting a link farm or phishing attempt to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute links across multiple domains. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://maristaslardero.es/userfiles/file/vumugetewimoromar.pdf In PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/54274443344.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/zixono.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/gawuvarerikinito.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/gubozan.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/48772496228.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/fabavofum.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/98569529004.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/jozufunu.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/39799132165.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/simavigofixibodud.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d5819a9bb---45179414890.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/duvuzixewabutizisa.pdfIn PDF document text
    • https://12shio3.com/contents/files/lupibakamogiwitulisojase.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/92456617174.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/86312880261.pdfIn PDF document text
    • https://vpmemorial.net/images/file/sodunod.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/wagex.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613424040d709---bumuxitolunanojisoziviwe.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/6286615935.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630756316.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/paxokadojoseg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hotstar+vip+mod+apk+downloadPDF 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_off0000af65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC777 15792 bytes
SHA-256: 88f9e74be0fa387c05f493a242119c2bb39b7532f86b9965c0d3d2902bd7491a
font_02_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 10656 bytes
SHA-256: 19227c0a5b912d1b59daea74ac98bc1f71f8677018d8577308a314eac6e4adbd

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