Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9ed8d2a17801d8…

MALICIOUS

PDF

80.3 KB Created: 2021-03-18 08:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f44e675e32c66fa1c75c496126ceb643 SHA-1: 7f90834e44ae80838a48141ab18e7d59566dcf13 SHA-256: 3a9ed8d2a17801d8ffdfc1a8f509bccd287befa6a5a31a0fdf184690a03048f2
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and the document's structure indicate an attempt to lure users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=hp+prime+graphing+calculator+user+guide PDF link annotation
    • https://cdn.sqhk.co/gipagigo/hdicSgg/gelofum.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/after_book_series_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/jaCxjf3/mopikojurak.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/hg9hijc/3178500636.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/bHZp8hh/43193630244.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/xuwam.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/hjAGThb/92647082142.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/Igi9Zhh/absorption_costing_income_statements_ignore.pdfIn PDF document text
    • http://kunewalijaxuna.getenjoyment.net/nezevena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7aedcc-401c-437f-a065-f6e92b5c4501/que_es_recoleccion_de_datos_estadistica.pdfIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_bf986339fc574955a4f12d393cf52991.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_56319077b1af451c8bd814d5c5cf9699.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6318fbda-5113-4981-ba71-90eaec8f69ba/thank_you_maam_by_langston_hughes_audio.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_12e5ab7c48cd4d4b8aa5eba16b322cf4.pdf?index=trueIn PDF document text
    • http://vegubom.atwebpages.com/45642482075.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/imperial_palace_east_gardens_japan_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/adonis_golden_ratio_workout.pdfIn PDF document text
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_81267b54b42d4fe28cde5dddc91167f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77eae643-7632-4281-8fc8-954ddd15afcb/vegetable_indian_dishes_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d45b39-686e-4109-8d58-a9b5c3da1eb4/free_wordpress_themes_for_bloggers_2019.pdfIn PDF document text
    • http://zoligagomuwe.onlinewebshop.net/memusaburesumafexak.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_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 5448 bytes
SHA-256: 011d57f18804c0acf5f4ce68ad3da4a7674189b7ae1e90392c98d03536911b1a
font_01_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 11140 bytes
SHA-256: cdfc2437fe8d300feae10c13e6df500e998ef524a1ef6c8c6243d2ab14a70416