Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a13e0f100905fa3…

MALICIOUS

PDF

83.0 KB Created: 2021-06-04 23:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e0e1bdecf5507bfc30dbefa0ca655d29 SHA-1: e641b91757de226c7d5313a40770da5cc643ec7d SHA-256: 2a13e0f100905fa3bf5fa27340cff48276cbac4311af80e38ac08ff2ed46b2f9
154 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on disposable hosting, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/pbw?utm_term=ejemplos+de+division+de+polinomios+entre+monomios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5fe8f137dc620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_60276f032405f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_6045053588ecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479446/normal_606c0e71e0e7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_60421e91bf09b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4487663/normal_60b4f86296cbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pulixojesu.pbworks.com/w/file/fetch/144489060/35100084404.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/what_am_i_riddles_answers_200-300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b425a4a-c8fe-4bd3-bbc8-ffb3f386e2ae/justice_corps_san_diego.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144604656/how_to_connect_to_lorex_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20a5388-f050-4f4b-a0fc-603913e0f000/nisozisififedabalumuk.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144537096/livawotavogukogirab.pdfIn PDF document text
    • http://rukutuxeriro.pbworks.com/w/file/fetch/144560994/zitarejek.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/17437663409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fddf1a7-1368-45fa-bfcf-a4ac16a82570/16491289687.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/goxukebonivokedexirafexuf.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/vanadeziralisatutafizozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b8720e-a525-4f88-8f22-9faa83cdb4b1/87231333279.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/xeradalimelewi.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/w/file/fetch/144440628/92731296137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c6a06f-c6af-4b01-95ad-f6f6e250b26d/44679189248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a24e1c-a88b-4e28-836d-436017e76f90/resumen_cien_aos_de_soledad_capitulo_2.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_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 4776 bytes
SHA-256: 424251ee525187b870986c3d63989a10023aa7ca3391f8ba791c948959b903b0
font_01_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 12456 bytes
SHA-256: 34cd571a282c93f1cb1cdbfa9106935571d2f51df4313732c822b7252e057c2e
font_02_sfnt_off00012e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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