Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d68bffacb3adfe…

MALICIOUS

PDF

82.8 KB Created: 2021-03-15 13:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eee4c3c7622c2dc4058d5b1221917064 SHA-1: e7847bcfc19176bd7df948c5cd59ccb7810c3525 SHA-256: 69d68bffacb3adfe338d986c3515da5faeb7554b093671dca7c230cb6eb50870
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, including a large link farm, suggesting a phishing or SEO poisoning attack. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=tratamiento+nutricional+en+anemia+ferropenica+pdf
    • http://kenurexil.22web.org/50480326751.pdf
    • https://vomenipof.weebly.com/uploads/1/3/4/5/134585177/60bc6c8394df32f.pdf
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/zivonebinaxugofap.pdf
    • https://janepaxe.weebly.com/uploads/1/3/4/0/134097288/wokadagamop_nufegebikon.pdf
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/e9c160c3.pdf
    • https://rejawezegevipi.weebly.com/uploads/1/3/1/4/131437848/vimujogisemig-dijivij-nibolup-wisabuxuxip.pdf
    • https://gapepaweduli.weebly.com/uploads/1/3/5/4/135400658/7380113.pdf
    • https://muvusawit.weebly.com/uploads/1/3/5/3/135392745/funesuluwusapeke.pdf
    • http://vukabuv.22web.org/wesomepenebimewaxipag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/50beb28d-66dc-4166-b332-c310a79167c6/how_to_stop_call_forwarding_on_iphone_8.pdf
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_db048f1577904a938c043aa62ce0e575.pdf?index=true
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_e8ea1bed647740e187d8ee0c8044d160.pdf?index=true
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_39f3863fb4cb4d3e979eb8f062fb8952.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0d57e4ad-dfd7-4d78-a0b7-27c4d1770eab/womepurobifopa.pdf
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_63b3b46f1fb44b9a87ec0f5df2661db8.pdf?index=true
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_7b5b405449d549d99a9f18b70b396447.pdf?index=true
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_d8ad3407054a4a81b66f8414b7bff273.pdf?index=true
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_1ffe490854a94022b189f14746e023b7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9fcddbf9-9b1d-4a3b-b55c-d19192d6ccb1/3063739463.pdf
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_b3e92b8063864972a53379d514ba724d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d4d693f9-209e-4e38-9bff-bd234095c155/what_is_the_best_book_for_stock_market_beginners.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ef.bin
e559794248ea67fe3a039b6af9a2351302499962cafc7b85b7d4a6b93a498bcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 5072 bytes
font_01_sfnt_off0001151a.bin
a5e3792c53e68605df6ae7e7e174a595cc9f3af766263f49e666968c2748448c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1151A 12932 bytes

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