Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae25788dddf8f54…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 06:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c3d59f8df0ea60ab715a5e507ee8504 SHA-1: c9131cfff26fe1f404ff2ba0ca429250b2fe4ed8 SHA-256: 6ae25788dddf8f5417831db9970e1b2e5218e95fffa6a00c5c8a1f54144c1730
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing attempt. The presence of these links and the overall detection profile strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=how+to+make+joystick+in+pokemon+go PDF link annotation
    • http://chapelguild.com/images/usr/24460750172.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/36641681083.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/39835880332.pdfIn PDF document text
    • http://santabruna.cl/upload/file/1144880826.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/70878964028.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/bumofur.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/11440316416.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/xilefepivip.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/98145590993.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/fowakopi.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109062007302789.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/komegunitefodedi.pdfIn PDF document text
    • http://jobsmarttampabay.com/files/public/femeribujirenadezobemi.pdfIn PDF document text
    • https://atavio.ru/files/file/lupasuxemapadilijasetu.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/gabagukugoraxatuwesemo.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/rijefususijagukeworak.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/vamewobewukoken.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/lojeti.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210919112318.pdfIn PDF document text
    • http://ed-union05.ru/files/file/39836344032.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/39222114220.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/f4debdd74ff6f2f77166302b294d4eff/60289771887.pdfIn PDF document text
    • http://autovoda.ru/upload/files/77139387144.pdfIn PDF document text
    • 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_off0000bc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9F 10984 bytes
SHA-256: 1ccc93b7bf5f4ebbd0483f90c5e1897b4ec384cf74af9e1037b2f23d89058565
font_01_sfnt_off0000d62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 16816 bytes
SHA-256: e6ae95f261b1f8c325abda51b3ac404c987500964daafe587da25c175a3d06e4

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