Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2da8ddc157c0ce…

MALICIOUS

PDF

83.8 KB Created: 2021-03-16 16:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f8f66ceddd0351815709ec6b023e5c80 SHA-1: e94e753a618f7232bdf51c2d50c4a2b313b0cf6a SHA-256: 5e2da8ddc157c0ce27d3e7d5c25819a54ab33a0cde88fb054fb4fa876a42618c
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO scam designed to redirect users to malicious content. The document body, though heavily corrupted, contains text related to 'Boolean algebra mcq questions and answers', which serves as a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/123?utm_term=boolean+algebra+mcq+questions+and+answers PDF link annotation
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/99349b1b6140c2.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/element_tv_codes_spectrum9ta3s.pdfIn PDF document text
    • http://kemytbok.xyz/waroferelij8k168.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/ijjicii/83172400476.pdfIn PDF document text
    • https://cdn.sqhk.co/metumolalub/KWhiNYd/zuruxofajesofekofobovaz.pdfIn PDF document text
    • http://euromarket.pro/zitetagebegusilutenule7gt8o.pdfIn PDF document text
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/ximig_kilekopenilema_fofewipoke_zujagupovoj.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/jiejdoX/residual_value_car_lease.pdfIn PDF document text
    • http://koreanluxe.com/wildgame_innovations_xb370_crossbow_partso208j.pdfIn PDF document text
    • http://finansi-7.online/sexaxinufilemozawirav9emf.pdfIn PDF document text
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/rekaxosem-datudatuj-xovawinave.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/hhEhehb/54946751830.pdfIn PDF document text
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/ganukof_punewivubege_vabopemesetotu.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/gjigliu/conquest_scents_evercalm.pdfIn PDF document text
    • https://malitorenifavo.weebly.com/uploads/1/3/4/0/134017021/141319.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/b4456abd-3723-4930-9992-985fe6d00b44/book_buffet_project_cake.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_d8ad1daa8f2645eca9b08498ed5185e6.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_59243c506a094d599897027eeda0a26a.pdf?index=trueIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_a4fe79ae28be473c9c14e02dbf1a6529.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sisaxu/63409529286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd9fea1-f5c8-441c-af4c-45f95730d4b4/form_of_verbs_list_a_to_z_with_urdu_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/how_to_program_olevia_tv_without_remote.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_2864f1ca78fc4412b0f9fbeda984ecaf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/000c181d-88e5-4c5b-997f-9535b0829e86/ti_82_connect_to_computer.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 5664 bytes
SHA-256: d7eca58061ca90b1fea9e597f07a8a0096024f8a147eae710b5fef69327d7ab6
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 11284 bytes
SHA-256: 6665a7570322442a4d78031eced9971f32a80f5c5dd3bef44e5edcf4aa68d286
font_02_sfnt_off00012c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C06 16272 bytes
SHA-256: 36ed9caf719e0849df8fd87ade7d51f3d04b8af5454f1aaa896d38a56b473f78

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