Malicious PDF — malware analysis report

Static analysis result for SHA-256 acad161cb4d98a6e…

MALICIOUS

PDF

74.5 KB Created: 2021-02-21 10:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aa7e01855a84f09575de5d53a5a7e66d SHA-1: 9683dbf5f420b61707dd630e1a073f5be6bda610 SHA-256: acad161cb4d98a6e40a4c3641f9f290eabfe73d56d3bef36871a3c1cc7fcec13
126 Risk Score

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 0.9998

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
  • 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://bologen.ru/123?utm_term=asl+non+manual+markers PDF link annotation
    • http://topemuliras.22web.org/bejewajofivixupagarikotu.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/despacito_para_flautalgirn.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/5568180.pdfIn PDF document text
    • http://masterpowerpoint.com/93883186549uy1eq.pdfIn PDF document text
    • http://meetchat.space/23547019769ys1pc.pdfIn PDF document text
    • https://votilolezin.weebly.com/uploads/1/3/4/3/134307270/majegewu-bogep.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/koradubotowupak.pdfIn PDF document text
    • http://bivozebavi.iblogger.org/answer_sheet_of_class_10_maths_ncert.pdfIn PDF document text
    • http://mini-cam1.club/financial_market_and_institutions_pdwu04i.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/djfiel4/33900754825.pdfIn PDF document text
    • http://jigunemav.22web.org/housewarming_invitation_template_telugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452624/normal_600125cf2820d.pdfIn PDF document text
    • https://piguvedulo.weebly.com/uploads/1/3/4/7/134724556/bamisujaxe_vugutog_notobovol_kazuvedesigid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5fec9fb1b87eb.pdfIn PDF document text
    • http://bogplaktnc.fun/capresso_burr_grinder_manual8ab1m.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/senodiw/aesthetic_fonts_copy_and_paste_android.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_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 4884 bytes
SHA-256: 00d15cc8dfbc78ee0a86747b4acc71c547539f115cd78e730c6bcd553b056d0f
font_01_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 10896 bytes
SHA-256: bfeee7721ef2b93fc49c6d84cfd43e25057479ab474684a361b434af52adcf19