Malicious PDF — malware analysis report

Static analysis result for SHA-256 614788bca31ea0a0…

MALICIOUS

PDF

90.5 KB Created: 2021-03-25 21:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 886d66ea85f839f8dbcbf53c72980672 SHA-1: 128253078a0f0dfbee1ef92681199491ffe323de SHA-256: 614788bca31ea0a0e374c3f04ecd4adba9d5c20a19f117c069b747aecff6a837
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with heuristics indicating a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to redirect users to phishing or malware sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://pelibifir.ru/award?keyword=apa+style+essay+example+pdf PDF link annotation
    • http://zavudonalu.66ghz.com/mesotelioma_peritoneal.pdfIn PDF document text
    • http://tugeredenazej.mywebcommunity.org/vatiferumobureraxuvuguju.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/pixijubasove.pdfIn PDF document text
    • http://dofolamemudowu.22web.org/anjana_anjani_film_song.pdfIn PDF document text
    • http://pawelemofub.iblogger.org/que_es_el_aprendizaje_activo.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/periodic_table_labeled.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_e3e4cc12bd164042a1fbff60f9ae750e.pdf?index=trueIn PDF document text
    • http://fufamiwebo.epizy.com/33476868050.pdfIn PDF document text
    • http://mukesul.epizy.com/bloodstained_guide_book.pdfIn PDF document text
    • http://ropedeni.epizy.com/dinojekolowanubazokeput.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/m_d_f_sheets.pdfIn PDF document text
    • http://ditelaxi.rf.gd/aesculap_dental_catalog.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_1406bf00412b4143af3941bb9657fa54.pdf?index=trueIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_7a9f2848ccd84dbb8f8d89cd0d5604bf.pdf?index=trueIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_f5d521e4a1974a2e8fc20e3a1d15d01f.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_475fa0579e7f435ba467d410e05797e6.pdf?index=trueIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_37aed5a07c49450ab9b90045175bbac9.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_66bf89e393cf4c9d94f13cc1fdf4381c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/tipo_de_archivo_de_audio_para_power_point.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/multiplying_monomials_and_binomials_worksheet.pdfIn PDF document text
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_8d7dcf41ccfb44d89ceefd405f16bfe8.pdf?index=trueIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_647c57d80aaa4f9baf1bb3e9b91debd7.pdf?index=trueIn 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_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 5248 bytes
SHA-256: 6e57cf86e47ebadae645b9d0f83f4d360a73c61ed9796447b0240bc3e7454f03
font_01_sfnt_off0001374b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374B 10980 bytes
SHA-256: 5a0d2fa1d38dd9d74f89c9e974901330593362ef25d5e0307b8c1fd671b8e13f