Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c433f61b3d0780a…

MALICIOUS

PDF

79.1 KB Created: 2021-04-08 04:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d2fe8de37544525d6740348f866596b0 SHA-1: a836dfb5867a0f8b2a3a5d6fd7d49fbe7ecbcaba SHA-256: 9c433f61b3d0780a4770dd790eafdb53d9458cb26a716a4e6099f4dbf141052d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a common tactic for link farms and phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs, such as 'https://ponafet.ru/123?utm_term=asphalt+9+android+60fps', suggest a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/123?utm_term=asphalt+9+android+60fps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401973/normal_601dca001234b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_60417cc353a74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_603c875e768d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371814/normal_5fcd9fd867c4f.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/34128769383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_6019099060f2b.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/what_does_red_wine_sauce_go_with.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_601f24d3e6338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_604888eb9cd68.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/the_mortal_instruments_books_set.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/a_arte_de_amar_frases.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/fa6bfeb6-3a02-410e-be4e-4a489fabbf79/what_is_importance_of_effective_communication.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_44a7d9a8e2f24850b747dd678a9a3731.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_83b3521eed714a13b667608140e56a20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0379e742-2735-450d-804d-d27bec370a7e/dovefumeri.pdfIn PDF document text
    • http://visunes.myartsonline.com/ielts_general_writing_task_2_topics_with_answers_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baab6393-24fe-4584-b7c3-980bfc95c88e/jordan_fabrics_free_jumper_dress_pattern.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_cd87bd2984c14e4daede21e32128dd7c.pdf?index=trueIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_26bddf427f164206b8b79122c05d6d40.pdf?index=trueIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_7ab487f22ae84126945a346313c730c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6ae26fa-4e08-4d10-a74b-6a564f4d71fb/videri.pdfIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_cb6bdd27d32246b7a729a3b034385af0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58522288-6699-4809-a350-8d7e436eda47/onkyo_tx-nr535_price_in_india.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_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 5568 bytes
SHA-256: 3dca414629d2df2cfc61b2e9b2764fab22c2482b2dce89b6e3112e5342e62297
font_01_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 11064 bytes
SHA-256: b4c346afd72a810a72732746560ffe0f05bf1450d89e494527197efce00232e7

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