Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23a5309ea88607e…

MALICIOUS

PDF

85.6 KB Created: 2020-12-04 21:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ed5120ed0841bb07cbbd38ed9b73565d SHA-1: 8d7c4e57dd8d3c8ad536b787d98934ed3316c25a SHA-256: f23a5309ea88607ecbc53f7fba8b9c561118afee2c88e1267e6516c8047760b5
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain metadata related to 'Metabolic syndrome guideline' and 'wkhtmltopdf', suggesting a lure document. The primary IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=metabolic+syndrome+guideline In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485443/normal_5fbb6c962751a.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/devixenegu.pdfIn PDF document text
    • https://tofojuduvebexaj.weebly.com/uploads/1/3/4/6/134650498/takopidixozajudep.pdfIn PDF document text
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/xutef_dikak_kobinakafowumi_tivaguxulep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5faf9ef301493.pdfIn PDF document text
    • https://xeforosoxipu.weebly.com/uploads/1/3/4/9/134900432/gamomenexegejupedevo.pdfIn PDF document text
    • https://nadosivilir.weebly.com/uploads/1/3/4/3/134316305/xaxekijawodamula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vokeri/bafufipejiwakukoxev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b4d1b66-7e47-4d69-b80a-5c7efdfd2fc8/xebiba.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/linear_equation_worksheet_stained_glass_window.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/302cc6c0-bdf8-46a6-9996-c7687039e9a4/12312158910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4478f89-6072-417e-a4aa-b50a36c1c660/a2212-_6t_2200kv_outrunner_brushless.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/lascal_buggy_board_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/texas_family_practice_manual_forms.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 5388 bytes
SHA-256: fe343610a8d316502b2fa512d575895e80f003ee23acb197656907bf6f4c921d
font_01_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 10584 bytes
SHA-256: fe07143df74a8384b13363fe06164b95aa07a7b9b186ede7b88db55a2aeaff7e
font_02_sfnt_off00013b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B82 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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