Malicious PDF — malware analysis report

Static analysis result for SHA-256 217e3caf8f87a5a8…

MALICIOUS

PDF

39.4 KB Created: 2020-11-08 12:21:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 80b217ac535b98fb16609982ae4e3f54 SHA-1: 77504134397bb838826c13c73f688beecf80e23d SHA-256: 217e3caf8f87a5a8226b0e660050d52d839546c19354c6f409e29ab0b32fbc70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of an embedded URL further supports malicious intent. The primary goal appears to be directing users to external resources, potentially for further exploitation or to boost search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://traffset.ru/aws?keyword=dragon+moon+fabric PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5fa39ac2989e9.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/6915380.pdfIn PDF document text
    • https://latijazaw.weebly.com/uploads/1/3/4/3/134312978/kedugegatimulepu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gelugif.files.wordpress.com/2020/11/menggabungkan_file_menjadi_satu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b318edc-3a21-4a34-a68c-1ad8e4547eb2/pisomekikogagatabox.pdfIn PDF document text
    • https://tafexoru.files.wordpress.com/2020/11/3294531957.pdfIn PDF document text
    • https://gurafutabi.files.wordpress.com/2020/11/grade_7_math_test.pdfIn PDF document text
    • https://wosesufow.files.wordpress.com/2020/11/minecraft_gore_mod.pdfIn PDF document text
    • https://zojemadej.files.wordpress.com/2020/11/73587489466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c7da4ab-b8eb-4106-b2bc-12bc618c3037/43028817313.pdfIn PDF document text
    • https://gawazufe.files.wordpress.com/2020/11/sri_suktam_by_anuradha_paudwal_mp3_free_download.pdfIn PDF document text
    • https://purexezeju.files.wordpress.com/2020/11/15519853848.pdfIn PDF document text
    • https://nekonenos.files.wordpress.com/2020/11/the_purple_book_biblical_foundations.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_off00005854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5854 5128 bytes
SHA-256: ae0ee273d5ef910b48d253eb65b6d6d5716d688a18fdf35a2525590547075d5e
font_01_sfnt_off000069c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C0 11968 bytes
SHA-256: 9720f401a3ce6153ca660b1cab8cd45b11c371cc17569a02e3a14cff5f9a1be0