Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50a53437544282b…

MALICIOUS

PDF

78.9 KB Created: 2021-04-16 02:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6f89c37f2e835a8b0c58e0bfa8f877da SHA-1: 2dbc8c41182e98bc16e4c72435708bf3dd1304e2 SHA-256: e50a53437544282b441c8f3478f6bca65c7e943d96317f4531917a0faced7246
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV both strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing the user to a URL that likely hosts a malicious payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=what+is+the+coldest+temperature+right+now PDF link annotation
    • http://omerkatanalp.com/kedovibufazoruletufe1kq6x.pdfIn PDF document text
    • http://life-news.tech/murudiriwivuwati96o.pdfIn PDF document text
    • http://healthyforczechrepublic.site/43916506502z05ai.pdfIn PDF document text
    • https://sotinele.weebly.com/uploads/1/3/4/6/134640455/tuvomojuxa.pdfIn PDF document text
    • http://wekeb.space/darkness_visible_mumford_and_sons_lyrics_meaningxn4cj.pdfIn PDF document text
    • http://mugedly.xyz/91792866984mj543.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/Qjhieih/fekozewuwodikunijiveda.pdfIn PDF document text
    • http://naturaitalia.space/affidavit_of_heirship_texas_templateswr01.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/6696543.pdfIn PDF document text
    • https://jevebuna.weebly.com/uploads/1/3/4/5/134594548/7500b0b369.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/perujodizovusir-tudewo.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/kPl2heL/metro_launcher_10_pro_apk.pdfIn PDF document text
    • https://gererojakomez.weebly.com/uploads/1/3/1/1/131163960/livenokivof-samos-kotifak.pdfIn PDF document text
    • http://uniques.space/what_was_the_result_of_the_9_11_attack5ovrm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fidikaxano.myartsonline.com/response_essay_introduction_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a467ba3-cd95-4d8f-96c4-cdb6b251ebef/romeo_y_julieta_resumen_corto_guion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80fc5f63-61c3-4df1-ac8c-b527e4a601cf/3567621827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f42bd8-3d07-4f2c-be08-f04036115753/crochet_patterns_ebook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1d5129-ffb8-4c48-809b-99775fa48ac7/zuwidulukopo.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/concepto_de_analisis_de_estados_financieros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df65397b-4a8e-44f4-8649-0332ba256eb3/making_content_comprehensible_for_elementary_english_learners_the_siop_model_3rd_ed.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_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 5592 bytes
SHA-256: 230c4a9ec6959fba96aedfcada26e85d60f1ee112431641bdc1a69df136302fa
font_01_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 11100 bytes
SHA-256: b67931442e67c1b26e380d4bc81dde7ad7fcf7714fe5ed6eca669a3c784d234d

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