Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b824a752ebdc119…

MALICIOUS

PDF

75.9 KB Created: 2021-02-17 07:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c3037ebcd7ae504ab7f7ff1d6270f6d9 SHA-1: 25a3eb187faab8320010f22219a52b6aa1139551 SHA-256: 8b824a752ebdc11943cdbafe42bedc4be64070c7d202665c2710b8ae6e0fcb1b
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+learn+writing+skills+sims+3 In PDF document text
    • https://bolubevegu.weebly.com/uploads/1/3/1/4/131454373/dexel_sujegivo.pdfIn PDF document text
    • http://nudistoff.club/503022170765h5oa.pdfIn PDF document text
    • http://nature-ital.space/do_you_russell_simmonsq79la.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/rizuzuku.pdfIn PDF document text
    • http://blu-ital.space/decimal_multiplication_and_division_worksheetf6x6a.pdfIn PDF document text
    • http://trikolor.site/apex_launcher_apk_4._0._1g1kw6.pdfIn PDF document text
    • http://socialwave.me/rascals_movie_480payoku.pdfIn PDF document text
    • http://didifofovura.iblogger.org/kezebaxunurubibupok.pdfIn PDF document text
    • http://bostpolamos.site/646849617461b5vp.pdfIn PDF document text
    • https://suxapenogabako.weebly.com/uploads/1/3/4/6/134602080/26811a6d40025e.pdfIn PDF document text
    • http://rent-nout.site/bsf_online_form_2018_gdjhpsu.pdfIn PDF document text
    • https://dafuzimobolu.weebly.com/uploads/1/3/4/4/134498283/5110f300.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/free_icons_for_website_design.pdfIn PDF document text
    • http://lokalumamone.iblogger.org/juana_la_cubana_alto_sax_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/punurum/tedopajubutivifojonijisid.pdfIn PDF document text
    • http://xewabilema.epizy.com/kadofus.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/ancient_greece_map_worksheet.pdfIn PDF document text
    • http://pubitawiwinas.rf.gd/jekipebazowaxolapewu.pdfIn PDF document text
    • http://bimivopi.epizy.com/65019534704.pdfIn PDF document text
    • http://fefisapuvekebi.epizy.com/captain_america_shield_hd_wallpaper.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_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 5284 bytes
SHA-256: 2421ecc4deffd775efbaf82b9ae641f36bd3b56a767736811bbcf2d1ddce9d48
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 11580 bytes
SHA-256: ac9ff8166f99b261643046f4afcc16b0f70f6a00b0efb63d935d6008b91cda54

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