Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9f69927b1f8ef5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 01:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47d8d36bda1c59a5370543246a0387be SHA-1: df20f99616a3721e3de6dde44851509dc5a8e270 SHA-256: 4b9f69927b1f8ef52b4be4d26471a4f3da3caf4eaee345fce0ff84d31c1bf01d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and appear to form a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://saxonrt.hu/img/userfiles/files/28895137373.pdf In PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/77648667195.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-19/20210919004923936786.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090304252190.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/96581536016.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/18282249118.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/jaton.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/zexajal.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/44866442237.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/numetokinan.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/tagaganesoneginutulov.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/notafazoximefonigaf.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/lanofufure.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36aa69fe5632bd59a020cd55212cada0/nakamokegowopifi.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/58012410426.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/35432879351.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109191001432708.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/poralevositoduzaperuwa.pdfIn PDF document text
    • https://duvanco.be/docs/files/ditevep.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/masisowaladitopalalavibi.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/19385150088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=naruto+senki+latest+version+downloadPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/93827463293.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_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 10560 bytes
SHA-256: 1ab86cd83d123a427f6774c311e90f7f8c0bec96dc910ae481f8de7254e5e2bb
font_01_sfnt_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 17836 bytes
SHA-256: 7ee914a045b39832381177212be37c1c18ad0c9f25ff1406d9dcb5d63c385f8b
font_02_sfnt_off0001231f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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