Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc029c18e2182a7c…

MALICIOUS

PDF

79.7 KB Created: 2021-03-14 01:15:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bf0299fcf77ba6f8deffb99e2135da04 SHA-1: 5c62f60fa48d30da1cfc88c504867a5807ff1f0e SHA-256: bc029c18e2182a7ce76c56a0aa7a378342fe9d99fdf979b4eef7a1afd9d2b440
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-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://dafemum.ru/123?utm_term=uc+browser+9.+5.+0++java PDF link annotation
    • http://fakexexu.sportsontheweb.net/petodigu.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/3594902.pdfIn PDF document text
    • https://migirebunimalab.weebly.com/uploads/1/3/1/3/131383914/patabu-ratusuzakiwonod.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/26139127168.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitines.myartsonline.com/88384680258.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_ed0acc5541ae49fca0e615b7d1687e5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/63615943108.pdfIn PDF document text
    • http://gegawuwiru.epizy.com/catering_company_profile_sample.pdfIn PDF document text
    • http://dunoziboxisi.epizy.com/xslv_etf_fact_sheet.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_51e567079d654520bfa20a6390343e0c.pdf?index=trueIn PDF document text
    • http://ropiviteginu.rf.gd/zaxuwateseberadufenob.pdfIn PDF document text
    • http://nenutufap.epizy.com/state_tax_withholding_worksheet.pdfIn PDF document text
    • http://vitupofelomar.epizy.com/tubemate_cracked_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/template_children_s_party_invitations.pdfIn PDF document text
    • http://rudinadaxom.rf.gd/79112111838.pdfIn PDF document text
    • http://ralarer.rf.gd/lazumexipedutiredoze.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/nopovur.pdfIn PDF document text
    • http://fasujenijasezos.rf.gd/chirutha_cinema_songs_free.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_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 5576 bytes
SHA-256: e337b9856024caf99ec7d36d927f3a2eab9d1117a3cacd8c45bd683b650979b0
font_01_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 22880 bytes
SHA-256: a356c1459cc71c08a45be75c69721a2fbe968fc9397e1a1c1f70da8f4a992f9d