Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c7f2f4b6c4a10a…

MALICIOUS

PDF

76.0 KB Created: 2021-03-25 14:28:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5f54b9662e2a7963e3b655795280a899 SHA-1: 5cb45e4ef041359975f871766119e7e7829de52e SHA-256: c9c7f2f4b6c4a10a00b40733a576386d6f0e96b029d51b5dda219ef291be64e4
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://seumenha.ru/strik?utm_term=spring+framework+example+github PDF link annotation
    • https://cdn.sqhk.co/gozafavapawu/rgjofic/criminal_case_search_delaware.pdfIn PDF document text
    • https://cdn.sqhk.co/tobajizil/6AT0Z8M/zabotuvoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492536/normal_602e0a0dbb5aa.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/iiehjFQ/couch_potato_to_5k_app_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_602213d9d5b1a.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/bRjfUhg/kivajepuruzawofuj.pdfIn PDF document text
    • http://milky-rp.space/pastest_mcq_dentistryg8k02.pdfIn PDF document text
    • https://cdn.sqhk.co/mafokesaxuvi/tjgcjcf/lomozupiresogug.pdfIn PDF document text
    • http://pokanupat.iblogger.org/juloxunenuresulegutud.pdfIn PDF document text
    • http://smcjd.com/dbt_skills_for_adolescent_handouts4s1jy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464052/normal_6045031fc94e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424646/normal_601e878191d15.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/ejdwcQa/texas_franchise_tax_report_forms_for_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sinofemuda.rf.gd/ofsted_report_for_heathfield_primary_school_nottingham.pdfIn PDF document text
    • http://sujonereduvuk.rf.gd/ruzoros.pdfIn PDF document text
    • http://vevasog.epizy.com/high_school_algebra_1_worksheets.pdfIn PDF document text
    • http://gapajafikotu.rf.gd/bell_200_bike_computer_manual.pdfIn PDF document text
    • http://kulaxukiju.epizy.com/install_play_store_apk_for_pc.pdfIn PDF document text
    • http://tusagotimus.epizy.com/fapogovamekekoviwat.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_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 5604 bytes
SHA-256: 3416e9790e79dd1617672fb534f23376fd519dbe669a8ee317cb680cf7b4eac9
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 10764 bytes
SHA-256: 400e78dcbabd478badc5cf57cf849aa00c65c7def56d8d50debe67d3b3106556