Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f9d2c0d2764ab3…

MALICIOUS

PDF

70.3 KB Created: 2021-01-23 11:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f0d62c75186d7d9df267d11ee61a1075 SHA-1: 9b398c29352a7433d4f78b29ece590ae3a0126f9 SHA-256: 66f9d2c0d2764ab3a933602754ed5cfb7ec3ef7c65fc15580a0a3f21b9cf7eee
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are associated with link farms. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the linked content. The document body, though heavily obfuscated, contains text that suggests a lure, possibly for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://trafftec.ru/123?utm_term=i+hate+you+dont+leave+me PDF link annotation
    • https://cdn.sqhk.co/juxerawabuf/ibSk3gf/safety_app_auxs_login.pdfIn PDF document text
    • https://site-1167961.mozfiles.com/files/1167961/fomedusovo.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/gJtVdgc/fimezekaboretiduvadafutuf.pdfIn PDF document text
    • https://site-1171687.mozfiles.com/files/1171687/97276306732.pdfIn PDF document text
    • https://site-1197643.mozfiles.com/files/1197643/76092297018.pdfIn PDF document text
    • https://site-1178883.mozfiles.com/files/1178883/5082944419.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/Ngd4ji4/best_pop_music_songs_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/suzironanes/jsRPjgZ/chromecast_built_in_apps.pdfIn PDF document text
    • http://fujopijur.iblogger.org/19273325284.pdfIn PDF document text
    • https://site-1172276.mozfiles.com/files/1172276/93109460246.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/JDln6hi/best_tiles_for_bathroom_shower_floor.pdfIn PDF document text
    • https://site-1175077.mozfiles.com/files/1175077/fugomitebewoxuk.pdfIn PDF document text
    • https://site-1168332.mozfiles.com/files/1168332/easy_dessert_recipes_no_bake_for_business.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/aeuhhvw/fokelulupiv.pdfIn PDF document text
    • https://site-1174284.mozfiles.com/files/1174284/project_on_pile_foundation.pdfIn PDF document text
    • http://tafedudim.22web.org/old_newspaper_template_psd_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sitasuwa.epizy.com/blood_test_report_of_cancer_patient.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_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 4888 bytes
SHA-256: 3042c2db54e71cbeac68f22665255b128433b497070931cea0aa58ea5e7adf2f
font_01_sfnt_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 11312 bytes
SHA-256: e7197ae542cae7a232f03427a07f2dcd19736472bed15ca441ffe24a8ca22c40

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