Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6897361fa4583b2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 09:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88ebfe29c6a2bddccefb6eb82aabe25d SHA-1: 95795f63206965626e4943a8c533c6023d288689 SHA-256: d6897361fa4583b2fcefacf20bbbcc330d5526ed59cd6e32367f08133e578f2d
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier strongly indicates maliciousness. The embedded JavaScript and numerous links suggest an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 https://vnmmalta.com/userfiles/file/seduvuligamezumu.pdf In PDF document text
    • https://ewt.cz/res/file/28137933604.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/96049497869.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/67818901938.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f7f2da0e70396fa1ac2abf8abcb36dc8/pegakudu.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/xaxafegiwegoka.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/tinawewuriledivoboxari.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/63187581888.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/teviboza.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348c7f33b26---96322683906.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/bidavamunodejuvudoroze.pdfIn PDF document text
    • http://www.pilartangguh.com/file/88107981341.pdfIn PDF document text
    • http://boxethai38.com/upload/file/wizefumuweferolafob.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/gasepuvudagumaje.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/suzodaje.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/morewivo.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/bomilobibebo.pdfIn PDF document text
    • http://geneolock.com/locktactyuma/userfiles/file/vipivizumo.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vabepodamukos.pdfIn PDF document text
    • http://polipack.ru/content/file/65396658943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+dragon+ball+z+psp+gamePDF link annotation
    • https://www.youtube.com/watch?v=u9rw2l9oirw&t=58sIn 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
    • https://www.youtube.com/watch?v=u9rw2l9oirw&t=58sIn 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_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 17872 bytes
SHA-256: e401cb29c9a9753dc86b9919ad539744921e95942515974b9c303b8aa8a6562c
font_01_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 10896 bytes
SHA-256: 4fd30cb3fd89ca447fd85a521796d9e153630f12870470c4f787f26ec410d574

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