Malicious PDF — malware analysis report

Static analysis result for SHA-256 9053dd8406e1c0e1…

MALICIOUS

PDF

119.9 KB Created: 2021-02-23 10:26:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 415a3b2790ee4e3f449e7358959d410f SHA-1: 88f82a4529ba6c32d8c7c28945493c2598f9b44f SHA-256: 9053dd8406e1c0e1cc9d7d790e56d8395bf899f3cd90123511899494617abd50
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 0.9999

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://baarspo.ru/strik?utm_term=firex+smoke+alarm+wiring+diagram PDF link annotation
    • http://fruct.space/7388011894opc6w.pdfIn PDF document text
    • http://copyright-rules-help.com/cartoon_network_artist_jobsyt2at.pdfIn PDF document text
    • http://qwert-ita.fun/322821542917333j.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/why_does_sodium_chloride_have_a_high_electrical_conductivity_when_moltenfpmsp.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/zesujuzunoxi.pdfIn PDF document text
    • http://nonretloli.site/shonen_jump_shaman_kingihjgh.pdfIn PDF document text
    • https://besuweleterum.weebly.com/uploads/1/3/2/8/132814030/993d79f0435.pdfIn PDF document text
    • http://canonsburglake.org/who_died_from_wu_tang_clanbwep4.pdfIn PDF document text
    • http://lifeshop.pro/73075264851yxkuq.pdfIn PDF document text
    • https://wokoxulepimam.weebly.com/uploads/1/3/1/4/131438011/7d5e66a.pdfIn PDF document text
    • http://eagleaff.com/movupukofisomder7x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378604/normal_5feba23088e07.pdfIn PDF document text
    • http://tricitysikhs.com/rorebinilixh2ei.pdfIn PDF document text
    • http://copyright-infringement.business/53826996515lsv2k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naremijex.epizy.com/spicejet_limited_gst_invoice.pdfIn PDF document text
    • http://maferodo.epizy.com/papoxewinajutatipuduk.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_off00019a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A3B 5324 bytes
SHA-256: 65328c45cbefe29603e2b754001da340da3b49db873f2acf93ec9d940274b089
font_01_sfnt_off0001ac57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC57 11176 bytes
SHA-256: 3b7312dbd37aac20d40e47bb3eb96e8fa064db1c653b46d22fc5484911915e99