Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf84b8393490776…

MALICIOUS

PDF

75.0 KB Created: 2021-06-12 05:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6ae23a5db9ce65d99b543dd4e722b6a7 SHA-1: eb026bad9cb41319875ea5d1c3afe61e5a4437ea SHA-256: adf84b83934907760cbdfdbe0c2923e98e01f418b7f866a11a7eaff28d2621e4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are presented as resources for game cheats, indicating a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://medvor.ru/pbw?utm_term=garena+free+fire+hack+version+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5fdbcecde640d.pdfIn PDF document text
    • https://denalozi.weebly.com/uploads/1/3/0/7/130776502/1646519.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472774/normal_6007e063b7601.pdfIn PDF document text
    • https://petominezejoza.weebly.com/uploads/1/3/2/3/132303337/tuxedunuridi.pdfIn PDF document text
    • https://zejabiforisog.weebly.com/uploads/1/3/4/2/134266870/2681591.pdfIn PDF document text
    • https://mazokozofifux.weebly.com/uploads/1/3/4/3/134305155/71c4a0d318e19.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/piwagapibukobol_tuperam_narorurezuximew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485572/normal_5ff9b994c2c11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463010/normal_605a572b40bd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_5fdbecb5d2469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogotobev.pbworks.com/f/dragon_city_breeding_legendary_dragons.pdfIn PDF document text
    • http://kiwuwas.pbworks.com/w/file/fetch/144771072/38984532972.pdfIn PDF document text
    • http://guvevef.pbworks.com/w/file/fetch/145162590/android_9_mate_10_lite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee3e0d5-de00-43e6-92b6-d52fbf9de07d/formula_de_conversion_de_pulgadas_a_milimetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53f37d3-fad9-4e38-9140-f010f0d3a601/what_is_the_main_theme_of_the_veldt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8fc8fee-c86a-410d-9b7c-16671d91451a/sap_basis_interview_questions_with_answers_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b83c07-aad9-4afb-b8f7-7ac4327153b7/volozebovipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d6eccd-de55-4983-81f2-cb5455ca52a7/el_rinoceronte_libro_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a9fdc6-d231-4822-9955-78945e807946/worejufujofet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b18731-7241-4844-b6e1-7cafae452f95/29901510265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97eb7ad8-7de2-4287-b3da-fed5dad92f7c/99272875130.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144489126/81460931821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fbb8b7f-e540-4c7b-8ec0-363224941161/97515677349.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 5368 bytes
SHA-256: bf64b1c64be6051b4c8dc187dba2d8016a35d241252b915609aabf0e8c1effcc
font_01_sfnt_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 10900 bytes
SHA-256: 319ab3d2915ba59490c0bb4acdec54835d7e86e10e6853c95141ba01eb5cd6d5