Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54105c2b5673626…

MALICIOUS

PDF

85.2 KB Created: 2021-05-14 12:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d8abca5c156268a31b866c11997fbbb SHA-1: 1b4f11473515b1c09ceef3dddd235f9b6a0e2cb1 SHA-256: d54105c2b5673626a3822cf48689d79bc04eaad66be02e46a89d6ab552b9df51
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=mcgraw+hill+education+sertifikas%25C4%25B1+nedir PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406202/normal_605cb8bb50d94.pdfIn PDF document text
    • http://salet.store/jukejogafipupiguwisxnikz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443624/normal_5fe7bbe53945f.pdfIn PDF document text
    • http://bred-enligne.com/233793336333j7e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_60318798310b1.pdfIn PDF document text
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/e25a3fe.pdfIn PDF document text
    • https://fuxureriwixivo.weebly.com/uploads/1/3/0/7/130739224/73a26.pdfIn PDF document text
    • http://pisodanijuke.iblogger.org/correctional_officer_exam_study_guide_nyc.pdfIn PDF document text
    • http://slamelina.website/niresaxefadizokujtrq5t.pdfIn PDF document text
    • https://kominuxopexazi.weebly.com/uploads/1/3/0/8/130814675/3426733.pdfIn PDF document text
    • http://medyayazilimtr.com/69087094327cdtc3.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/32000d9a38770.pdfIn PDF document text
    • https://fabebebu.weebly.com/uploads/1/3/2/7/132740756/8a6f6a9a933.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://manetoxunotaju.epizy.com/essential_words_for_the_toefl.pdfIn PDF document text
    • http://xavimon.epizy.com/zegarek_tissot_t-touch_expert_solar_ii_titanium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574b6823-1490-4ba8-9b3b-c91f4c00122b/68464947221.pdfIn PDF document text
    • http://wavudipikudela.epizy.com/libro_de_instrumentacion_industrial_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3db4832c-150e-47d8-98fa-6b0ce68b48f6/formulas_para_calcular_el_volumen_de_diferentes_figuras_geometricas.pdfIn PDF document text
    • http://rodujuvutadaxam.epizy.com/dibujo_arquitectonico_sena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592eea52-b1b8-4bcc-9088-7a81ca09f332/arduino_projects_free_download.pdfIn PDF document text
    • http://surifetopene.epizy.com/dreamweaver_basic_tutorial.pdfIn PDF document text
    • http://makowadoka.epizy.com/lixekironef.pdfIn PDF document text
    • http://tozetusetexu.rf.gd/math_quiz_bee_questions_and_answers_for_grade_8.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_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 5476 bytes
SHA-256: 2b11fe773f2b9d56415fc3cb40e4995a5cb7dcd0cd689d785f35531436572b20
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 12344 bytes
SHA-256: 044f3ca98e649d3db480667f0e457ea9ef49be92ba4ac1a1e51637b785b38eed
font_02_sfnt_off00012af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF1 17408 bytes
SHA-256: ce56206c99f6591cc170a55d0b114203fb526a75a1f2ae99aa36597f5ad8c32b

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