Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c653ff2b823cabd…

MALICIOUS

PDF

72.7 KB Created: 2021-06-06 07:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e202a885faa0da008e067684831b265e SHA-1: 0667f6291f087b19a377bff59aca7e1dd979ca4e SHA-256: 6c653ff2b823cabd7bc05682a5e64cf8d3ebba3bad9d86bfcd34ebf06b18d5eb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs, with one prominent URL pointing to 'nomylo.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to a blood sugar monitor, likely serving as a lure.

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://nomylo.ru/pbw?utm_term=how+to+use+relion+confirm+blood+sugar+monitor
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ff6988f3061c.pdf
    • https://lewanodeb.weebly.com/uploads/1/3/4/8/134885095/sodipa_bisiwuraxiveri_xivum.pdf
    • https://wivezinafixozut.weebly.com/uploads/1/3/0/9/130969190/9993624.pdf
    • https://cdn-cms.f-static.net/uploads/4415544/normal_600d4f9d2e5a7.pdf
    • https://gajabalavira.weebly.com/uploads/1/3/5/3/135347595/7376694.pdf
    • https://static.s123-cdn-static-d.com/uploads/4496816/normal_60b1e8aee0f3e.pdf
    • https://cdn-cms.f-static.net/uploads/4451753/normal_6064d60b1bdc7.pdf
    • https://cdn-cms.f-static.net/uploads/4421208/normal_605d8bea97ca2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a2427b69-2061-462b-a5a6-9c8ad7df19a6/intermec_pm43_ribbon_error.pdf
    • http://kimotamiju.pbworks.com/f/xusuvojewuxozakixi.pdf
    • http://kevuxezedila.pbworks.com/w/file/fetch/144449736/deckel_fp1_manual.pdf
    • http://tagexoba.pbworks.com/w/file/fetch/144621273/nolizulunusajet.pdf
    • http://bekivuxuga.pbworks.com/f/evaluating_numerical_expressions_with_exponents_worksheets_answers.pdf
    • http://rorazokazog.pbworks.com/w/file/fetch/144556935/how_to_calculate_maturity_amount_in_lic_endowment_policy.pdf
    • http://noxixap.pbworks.com/w/file/fetch/144426375/pdf_calendario_2020_mexico_para_imprimir_gratis_chile.pdf
    • http://zopilep.pbworks.com/f/right_triangle_inscribed_in_a_circle_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/5cfbefda-6069-41e4-b2d7-1d37c6ced2c7/41376696751.pdf
    • http://najapenoz.pbworks.com/w/file/fetch/144542448/rudekenusorivofir.pdf
    • http://jifosez.pbworks.com/w/file/fetch/144630015/autopage_c3-rs_730_installation_manual.pdf
    • http://wuranosa.pbworks.com/w/file/fetch/144689454/culturally_responsive_teaching_and_the_brain_sparknotes.pdf
    • http://ruwomodanom.pbworks.com/w/file/fetch/144465552/63070028961.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb7.bin
2ffe64fa59a98d55382a2e8b02759d447eec4d9c5fb8f0f9e664568ba3f4c9f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 5532 bytes
font_01_sfnt_off0000f181.bin
3ea8bb47506d21a2c025441ee15ef3c628434e3fb137332105d51c835469900e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 10460 bytes

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