Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54d8cc3ed7f97ff…

MALICIOUS

PDF

81.0 KB Created: 2021-04-08 20:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 46c36c28f16f836a44f311183e71ba24 SHA-1: d65887e2174b561689334370048c9ac4f7f505a3 SHA-256: f54d8cc3ed7f97ff66c16fe46cd39d7396f67401d508715685ffcbde575cbf8c
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, suggesting a phishing or malware distribution attempt. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, contains text related to checking COVID-19 test reports, indicating a lure to direct users to malicious sites like https://ponafet.ru/strik.

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://ponafet.ru/strik?utm_term=how+to+check+covid+19+test+report+online+in+maharashtra PDF link annotation
    • https://balebapu.weebly.com/uploads/1/3/5/3/135322653/xinuwilajanawirijilu.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/donowiranalezeje.pdfIn PDF document text
    • http://seplafond.xyz/luzanuwuxhrghn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_603caa3df11de.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/schaums_outline_of_differential_equations_4th_edition_solutions.pdfIn PDF document text
    • https://relelije.weebly.com/uploads/1/3/1/4/131438324/6c31a3fa444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fdbd01186c42.pdfIn PDF document text
    • http://begdas.space/200277903500kniz.pdfIn PDF document text
    • https://leloturopuroka.weebly.com/uploads/1/3/5/9/135956930/ba6c6ee9e010a6.pdfIn PDF document text
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/5857157.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/8241144580.pdfIn PDF document text
    • http://scoretdho.best/14313390954toc2r.pdfIn PDF document text
    • http://uaportal.site/nugolomopojituvgefb.pdfIn PDF document text
    • http://afracheat1.xyz/buwunoba9w3f3.pdfIn PDF document text
    • http://my-favshopc.online/lujusuxezuduliruvotuzmt4h6.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/begijufadi/24969088440.pdfIn PDF document text
    • http://fajenadiwizowo.atwebpages.com/mec_bncc_educao_infantil_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/mantoux_test_report_sample.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/29054459705.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_off0000fa1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1A 5700 bytes
SHA-256: 7ef931e2fc9d36bce5b41508770e0c1f19312c72841c8421ef881e9022c251e8
font_01_sfnt_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 11488 bytes
SHA-256: 1ce89b8d902e0cf97fcbe2be6b12cbace985245cd5acd93c53558cc95e1a5aaa

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