Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99130d6aa662e12…

MALICIOUS

PDF

65.6 KB Created: 2021-01-15 15:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 04017a62577e5ca41ed860d83ec18a70 SHA-1: 10c4657c717ca78173fefffffd5d013eafde4e65 SHA-256: f99130d6aa662e12f57fa885c4c3209ce26825531811f0a50a3b7c45c677f32a
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The embedded URLs and the nature of the heuristics suggest the document is designed to lure users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the ML classifier output strongly indicate malicious intent.

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://traffmen.ru/123?utm_term=first+impressions+salon+frisco+co In PDF document text
    • https://site-1173612.mozfiles.com/files/1173612/87483537415.pdfIn PDF document text
    • https://site-1211863.mozfiles.com/files/1211863/king_bed_sheet_sets_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_5fd127fba153b.pdfIn PDF document text
    • https://kepowawovexe.weebly.com/uploads/1/3/4/0/134016687/vabun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451206/normal_5fa1165e2c4d9.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/hjberMP/buxuguwawulijuxevepatavin.pdfIn PDF document text
    • https://site-1177333.mozfiles.com/files/1177333/ice_cream_roll_machine_price_in_chennai.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/ziefEie/king_s_raid_successors_of_the_will_funimation.pdfIn PDF document text
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/zomonemifi_moramumunureso_bukiguzilij.pdfIn PDF document text
    • https://redojakora.weebly.com/uploads/1/3/2/6/132682723/rimatanuk-rasefu.pdfIn PDF document text
    • https://kijatuvoriwoze.weebly.com/uploads/1/3/4/3/134352029/2800924.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/bezorito/jufasi.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_off0000c3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C2 5116 bytes
SHA-256: 65b62972558c61c3a5261a84fc178f7fd9cb05490ed134a8f7e0c99cb534a00b
font_01_sfnt_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 10776 bytes
SHA-256: 5d194df8d86499f68bfb884003376fb7e8a97405b5e6702085f90abe2fcaa883

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