Malicious PDF — malware analysis report

Static analysis result for SHA-256 402996f7075f12db…

MALICIOUS

PDF

70.3 KB Created: 2021-09-14 05:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae764aab4f109395245e3627d57c3ba8 SHA-1: f8dc0db9e69026599c45122a4b77791ad5817d67 SHA-256: 402996f7075f12db0d8d55992035c9f44f610199ea38e4fac0b4db14f38101a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to potentially harmful sites. The presence of multiple unknown URLs points towards a phishing or malware distribution scheme.

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 http://imhyuk.com/imhyukeditor/userfile/file/35948717547.pdf In PDF document text
    • http://ipsgroupjjn.org/userfiles/file/xibuzimesaziwogi.pdfIn PDF document text
    • http://rsst77.ru/upload/files/xubajebibasuxefudizasipip.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/4264942409.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/nugubelunusalomi.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/16189770834.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/52908113343.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/96411191491.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/polifekusa.pdfIn PDF document text
    • http://kaies.net/upfiles/file/volewo.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/37605568111.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/basatule.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/68775880508.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef594c16a1---27432714050.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/dajudixonutimuxalekumuj.pdfIn PDF document text
    • https://kede.org/userfiles/file/3997014811.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/kadikenekexufujimovaze.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/54940920176.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/29113523062.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/11830291825.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/86284392317.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/pavebawiwitexirigagozegin.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/41560147655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=unit+circle+degrees+and+radiansPDF 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_off0000b2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABB 16188 bytes
SHA-256: 5a005ebd60c95b9c2ce14f0bf9f2a00d46652ba94fbe991e4f6134453b15ce20
font_02_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 10432 bytes
SHA-256: cdcb07843cc7b60639022f6b8cff2c33fa6d9a8a2f494c99c76c3cc22a69ce10

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