Malicious PDF — malware analysis report

Static analysis result for SHA-256 816e25b6ede8b345…

MALICIOUS

PDF

78.4 KB Created: 2021-04-20 01:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29af31cb09b2e360a82f3acfb3983035 SHA-1: 82db6cc06b79195d7b07013bc679e0c701c44d94 SHA-256: 816e25b6ede8b3455b5031eca243e6e2f77f39308b96d2c0d7b2f29985323171
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=is+forrest+fenn+alive+2020
    • http://xalenupom.getenjoyment.net/exercice_corrig_capteur_de_temprature.pdf
    • http://polobasopika.mywebcommunity.org/school_counseling_interview_questions.pdf
    • http://gexomafe.mypressonline.com/13727210046.pdf
    • http://palopepidek.mypressonline.com/human_physiology_cardiovascular_system.pdf
    • http://vajukadezazi.getenjoyment.net/comment_accueillir_un_client_dans_un_hotel.pdf
    • https://mejojesakawevud.weebly.com/uploads/1/3/1/4/131438193/77f6cb0b55.pdf
    • https://regakoxunurur.weebly.com/uploads/1/3/4/3/134380337/kitemagu.pdf
    • http://tifoxikutawe.sportsontheweb.net/some_basic_theory_for_statistical_inference.pdf
    • http://mitedujonajezed.scienceontheweb.net/35945046623.pdf
    • http://pefiworawodud.mypressonline.com/mefebevoxipuvubomo.pdf
    • http://jovopomutulilo.medianewsonline.com/from_hell_alan_moore_espaol.pdf
    • http://muvepifare.mygamesonline.org/no_excuses_book_brian_tracy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_312bbcf9b1d04e1793718617a545bcac.pdf?index=true
    • http://zirutabu.myartsonline.com/kasumerupox.pdf
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_5aedb3b78326435fb94dee156ed79c71.pdf?index=true
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_11ad6908695f4bdeab59567d2bb37915.pdf?index=true
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_05bbf0cb84ff41beb3e02c890ea511b3.pdf?index=true
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_87fac20ccdcf4bdf8c4c268d4d9527c7.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_05b54ce601bc4d158f6757a7fb283a4b.pdf?index=true
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_8665f7a76d024d28a0dc618342195f73.pdf?index=true
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_c201256089c840708e2ad0ba46d94dbf.pdf?index=true
    • https://bd5e8a39-7345-4d1c-b933-e8ec171ec4b0.filesusr.com/ugd/2dab9e_a665d5e2b4384b9aaa60caf18bb3aef5.pdf?index=true
    • http://josuxak.atwebpages.com/jurnal_bani_abbasiyah.pdf
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_d449aacd8f814ad5807d9f3d600c5db7.pdf?index=true
    • 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_off0000f448.bin
3f1fc89c2caa3fb05d6578c2a4b0da4535d5559ffe9605c86540e7b8c9020c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 5032 bytes
font_01_sfnt_off0001057b.bin
0911b52494e3a8b5e7e7eb0f5c92302a0b05943e93120629c468aa29abc3b3c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 11784 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.