Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c349cdd2da1481…

MALICIOUS

PDF

72.8 KB Created: 2021-05-02 15:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dc98028ff83ab67f71ab56c6efbfba77 SHA-1: 2eaa0b2bdb7b529a1b484f00951ebdecade2d54c SHA-256: 51c349cdd2da1481d1df885df277ae8b0307b411f3c6665faf748f45086a4177
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with several pointing to disposable hosting and potentially malicious domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm heuristics further supports this attack pattern.

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://zajinet.ru/strik?utm_term=bloomingdale%2527s+walt+whitman+mall+huntington+ny PDF link annotation
    • http://biweekamnf.com/sozodobk9zg.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/the_oresteia_of_aeschylus_ted_hughes.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/66728019364.pdfIn PDF document text
    • http://creampiepow.club/admission_form_of_sainik_school_tilaiyaz348c.pdfIn PDF document text
    • http://medicinfo.online/dr_lynette_buschbacher_military_histx1zz4.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/aviones_de_papel_planos_para_armar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/560bf231-6bad-45bf-9d13-2784c2755c0e/how_to_win_breach_of_contract_case.pdfIn PDF document text
    • http://kixelekiteduxaz.rf.gd/filehippo_itunes_free.pdfIn PDF document text
    • http://nakabamafirek.epizy.com/69663743648.pdfIn PDF document text
    • http://wetoxisifogif.epizy.com/95087441500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25887a95-c62d-4325-908c-a8544fa7771b/2154018492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0af6696-4149-4487-b543-5b5ba68dc536/rewakemifol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07daa97f-9953-4ab8-9a54-bbe73fb422ce/runejexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e89668-624d-4320-ac1f-23a3f1b51eb1/14203605143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498baea8-b3d0-4f74-b60b-0c0213f8db8d/dovodipaganot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07888cb6-948b-4a07-9070-a15593e38584/tituvaxulolaxanodefalaja.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_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 5420 bytes
SHA-256: b59499c6c835dfa7f0a21c97be11313d8d1707d56959163fb31242d549ff332a
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 11564 bytes
SHA-256: 078bb21805874a8684b5347b26d15ff7081c9cbcdbd64435bfd583cb46a8e5b9

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