Malicious PDF — malware analysis report

Static analysis result for SHA-256 5493d533502f66bf…

MALICIOUS

PDF

75.2 KB Created: 2021-02-03 02:10:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 33c0eaa7f68965b68fafdde3207a38ae SHA-1: f25aa6cc88ff5a2d50bfd4d3508c3e9e93fe0b56 SHA-256: 5493d533502f66bf2d371776db7edd2fda0423494b19603e448134b44ab660b4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document contains numerous embedded URLs, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness, aligning with the ClamAV detection of a 'Pdf.Phishing.Trojan'.

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://yafferge.ru/aws?utm_term=arturo+islas+the+rain+god+pdf In PDF document text
    • http://ehaberdevlet.com/mac_os_sierra_iso_image_free_downloadrjjk0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411501/normal_5fdfb3802edb7.pdfIn PDF document text
    • http://wiwusigeronisu.66ghz.com/woret.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fcb5e34632ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5fe789dd54007.pdfIn PDF document text
    • https://voxukosobezut.weebly.com/uploads/1/3/4/8/134846839/6639396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491665/normal_600515db21cb9.pdfIn PDF document text
    • https://bugotenopiziwa.weebly.com/uploads/1/3/0/9/130969298/nejinejubo.pdfIn PDF document text
    • http://voicebftyi.com/tantra_mantra_free_downloadji5p5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dotixoxikal.rf.gd/70263940851.pdfIn PDF document text
    • http://nujuxat.epizy.com/jifetuguwu.pdfIn PDF document text
    • http://jawikaginixuxuz.rf.gd/modicare_business_plan_ppt.pdfIn PDF document text
    • http://jelelonu.rf.gd/migelazenabosuv.pdfIn PDF document text
    • http://baniteb.epizy.com/92034807897.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_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 5292 bytes
SHA-256: 5ae14b90f5d9946c454da0e528cbd72c9f336c81b40e42624d72c50aff99cb53
font_01_sfnt_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 11548 bytes
SHA-256: 9658de56d4b88e214e894191fa8e928f65c8a2a95df2fa394d19cb52ea2159ed

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