Malicious PDF — malware analysis report

Static analysis result for SHA-256 0941f0b0de5ddad8…

MALICIOUS

PDF

162.2 KB Created: 2021-03-20 18:32:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 09ad0c4ef33c3d5251e3cd07fb545dcd SHA-1: 250928563c9459443d009b1cc776c2be30fa0256 SHA-256: 0941f0b0de5ddad8c4ec2c40422cfc51e84b565bf8792fd688a1e0872725c8be
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm. One prominent URL, 'https://nipisod.ru/strik?utm_term=marantz+portable+cassette+recorder+pmd+201', is presented in a way that suggests it is a search result, likely to trick users into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=marantz+portable+cassette+recorder+pmd+201 PDF link annotation
    • http://kunujunekedi.mygamesonline.org/can_you_be_a_nutritionist_without_a_degree.pdfIn PDF document text
    • http://zijezototironor.22web.org/how_much_power_can_a_stock_6.0_powerstroke_handle.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/lifehacker_editor.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/tiny_homes_plans_canada.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/50165660153.pdfIn PDF document text
    • http://tekeriset.iblogger.org/37387161526.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/articulo_de_opinion_sobre_el_maltrato_animal.pdfIn PDF document text
    • http://pitikudefojeken.getenjoyment.net/16357457153.pdfIn PDF document text
    • http://nodalaxav.22web.org/sixirajumalofavudopol.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/74866102597.pdfIn PDF document text
    • http://tupujetu.sportsontheweb.net/79901917797.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/c84493ef-05b2-4329-9fb8-13cb4d0bbf05/sotiruwegepa.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_08ddf374e1eb4114bfd744518253db4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09a288cc-889b-4b56-af62-7c539b6cf308/73297909619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb9c1b2-848d-4bdb-96d2-22795c9cf425/thermador_oven_reviews.pdfIn PDF document text
    • http://fagufobukabovu.epizy.com/femabopulu.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_6a6037efbb08463bad8b89512c7a5705.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e450a05b-8a16-489c-ad9c-a2e83a6ad079/ncert_math_textbook_for_class_6.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_a36f0be23bb4446a90cf120856979f8e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdce38fc-0a6c-49cc-8835-ef62c3c9dd23/situnu.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_95ffd16307ca4fd68ab4a596649c13d9.pdf?index=trueIn PDF document text
    • http://dopovis.myartsonline.com/current_issues_in_environmental_ethics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8523ea-a39b-4a90-b3bf-91ccfd7b2a94/rowirorojujites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19f97c6-bc26-406a-83aa-51090466f8d9/brandon_ingram_height_and_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1f701f-e4da-4188-a0e3-aeaba1bfa146/human_resource_management_definition_in_urdu.pdfIn PDF document text
    • https://8084a2ae-6cfb-493d-8155-0d4219c0f7e3.filesusr.com/ugd/5b3528_1878ebc8638b4e02a8504d84c7701bcd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9fd129-6b3e-4fcf-9102-624e4113bcfd/24761862665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/208b992c-efd5-4638-ba61-3a28f845d1e7/wemezu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B64 9416 bytes
SHA-256: b42368aa15076f1924e7f2ca5f0b61238c1146d18ae3f1edfa72e2b925a89d2e
font_01_sfnt_off00023b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B16 5740 bytes
SHA-256: 4f81d394c29625e73f72cf419417f98e00ae00753282f090e079d8a9e50ef700
font_02_sfnt_off00024e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E9C 13480 bytes
SHA-256: 8379821a0f0fd18435296608811d638cf8924d5eb84919528102afdc6429dbcb