Malicious PDF — malware analysis report

Static analysis result for SHA-256 359eb5ca6cc8d037…

MALICIOUS

PDF

78.6 KB Created: 2021-09-22 12:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49d0649924c8dfc0d48ac5532c554c6f SHA-1: 331e860c36a672b8bfa02c39a4cd4fc6ec991d80 SHA-256: 359eb5ca6cc8d03765de71a46db6d46e8c96afcacd1ca814e4d91c62c903dbfe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable or unknown domains, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.s4b.nl/upload/files/nixege.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d43b54e3---98315625925.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/6514426482.pdfIn PDF document text
    • http://www.bash.cl/media/file/80977355684.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/45310290278.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/gilokitevixabaloxe.pdfIn PDF document text
    • https://anandalaya.in/resources/file/42958180623.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/bizilutavidumeme.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/xikixa.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/ragoluxibap.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/61070404118.pdfIn PDF document text
    • http://hevolta.com/upload/file/89616313507.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/11091520850.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/zubebunifuwisamedurukomut.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109190254424204.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/runebosewusomadimi.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/54649774025.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/46734116886.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/38445315087.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/99553102294.pdfIn PDF document text
    • https://thehouseproduction.net/file/wuvodepiv.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/39110828275.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/vegokiloledinemini.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/fewitawefe.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/wevozafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+does+a+luck+potion+do+in+minecraftPDF 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_off0000c887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 19432 bytes
SHA-256: 854d4b087765be60ca814c2e3e7ac0e3f2f8e46ad95434c49cff2a46a9a3a793
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 11072 bytes
SHA-256: 1fcce40161dd5d0ff202776dd568dbc42e83e943a2f1264de12c1b01527b4393

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