Malicious PDF — malware analysis report

Static analysis result for SHA-256 520b854a5232e52f…

MALICIOUS

PDF

81.3 KB Created: 2021-05-09 12:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ea21b28d60f3311fbc8efe2b7616ccef SHA-1: 79eb34b928c8b9dfb07554f85fd5e566dfc88f62 SHA-256: 520b854a5232e52f3c034609c71425ffbdbf7145cfcd2776808c91e4c9eff0a4
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to external sites, with one URL specifically identified as a potential malicious redirect. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the PDF structure and embedded URLs point to an attempt to exploit user trust by masquerading as a driver download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=maschine+mikro+2+driver PDF link annotation
    • http://thecet.xyz/how_long_would_it_take_to_count_to_one_hundred_milliona6imw.pdfIn PDF document text
    • https://damafofazawarag.weebly.com/uploads/1/3/4/3/134369947/bujoted_sabemu_rufusap.pdfIn PDF document text
    • https://duvefotod.weebly.com/uploads/1/3/1/3/131380754/28fe18.pdfIn PDF document text
    • https://murezujal.weebly.com/uploads/1/3/5/3/135305344/625386.pdfIn PDF document text
    • http://1ux.site/what_if_series_marvel_episodesty19q.pdfIn PDF document text
    • http://kisapokabawexew.22web.org/calculus_of_variations_fomin.pdfIn PDF document text
    • http://generalmassage.online/dimanolikalevfh1h.pdfIn PDF document text
    • http://erethiztzj.space/mahalaxmi_calendar_sep_2019hoajt.pdfIn PDF document text
    • http://nitopito.22web.org/bozopefex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulovuvaf.epizy.com/73844235080.pdfIn PDF document text
    • http://tutunod.epizy.com/social_media_management_proposal.pdfIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_8f9cf9180fd54c58b255cfeac52ae266.pdf?index=trueIn PDF document text
    • http://fufibilola.epizy.com/delhi_belly_movie_free_mp4.pdfIn PDF document text
    • http://wenulusevikofa.myartsonline.com/botaxozijerina.pdfIn PDF document text
    • https://3b1a0cff-dc54-4917-88c1-cdf904a8db56.filesusr.com/ugd/60aab8_28cfbc4ef9454694b5592fa7910af7c1.pdf?index=trueIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_e5c265e1c33d4671928ca5df1a7b8156.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_9aed05a881884d84ba7763ec84d779af.pdf?index=trueIn PDF document text
    • http://zigubogujivo.epizy.com/speaking_fluent_english_free_download.pdfIn PDF document text
    • http://tulajadulixo.myartsonline.com/escala_de_estrategias_de_afrontamiento.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_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 5408 bytes
SHA-256: d5c7f157300e2712252dbc985f923b508e2c4db35dab8b23357cd5fe74fe9f6f
font_01_sfnt_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 11292 bytes
SHA-256: f6f20753f027592bff385888e8af5ddcf5b1002b45ff9a810cc9df9863683315

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