Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a8621152f7513b…

MALICIOUS

PDF

90.5 KB Created: 2021-03-25 01:02:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c507b66242db690ef057adc779f6392e SHA-1: 9764ee949b48e19b328333e7762a12707fb75925 SHA-256: b6a8621152f7513bb203265ff55e60cacc4532f20b2208ab629a0cd45d930311
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=mi+propio+auto+chapter+11 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381964/normal_5fc8101147b48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_602330350cd98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_605b1ea9b588b.pdfIn PDF document text
    • https://gigufeti.weebly.com/uploads/1/3/4/6/134633464/mixox.pdfIn PDF document text
    • https://lewugudufe.weebly.com/uploads/1/3/4/6/134668986/guwobamaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417045/normal_60170396ad958.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/9962ca85-7a84-4a3b-b6df-98e2afd085fe/php_mcq_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/free_math_coordinate_graphing_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b0da67-f682-4229-b61b-80f5702c8e5d/lubezusapenulaf.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/66971905220.pdfIn PDF document text
    • http://maxusopexezevob.epizy.com/aboveground_storage_tanks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2aece24-9850-4f5a-a355-14c838902c2d/la_casa_de_los_espiritus_pelicula_completa_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d11839-f458-49b6-b914-f89f1f460093/lasko_ultra_slim_tower_heater_instructions.pdfIn PDF document text
    • http://kamegil.epizy.com/74632503644.pdfIn PDF document text
    • http://ximitexus.epizy.com/los_cinco_lenguajes_del_amor_libro_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df7b8a39-662a-4cad-9e6d-7d595a9b6ec5/what_is_the_moral_of_rikki_tikki_tavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d44d26e-e35a-4d41-aed4-fad2637d9751/fumer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb12f67-7900-46a7-887b-66e80e285d17/motiwenidixugavelaxukare.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/botajoxutijapiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/effcffd3-1814-41aa-84ea-4f67f8ae56e8/xpress_m2835dw_wireless_setup.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001222d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222D 4868 bytes
SHA-256: e8387a82308dcca309af1ca239a9c145a2fb372f2f8871d54f902fa12f74e8f2
font_01_sfnt_off000132c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C3 13228 bytes
SHA-256: 2b6360ace8b7dc26cc40993cb0aa14135be2844a661ba047dc978a2fa3ee67ce

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