Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d27c5ee0a90e63…

MALICIOUS

PDF

82.1 KB Created: 2021-02-18 23:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e2b22b0b408199e7e8dfeac1e45619a4 SHA-1: 1fe60be332cad240b5f3940dd3b28a9316c01171 SHA-256: 59d27c5ee0a90e63276895ac114903c588fbb5f9ab6c10ea7732dce2315a9c39
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, likely for a scam. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score suggest malicious intent, possibly involving exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/strik?utm_term=how+to+set+code+on+sentry+safe+x055 PDF link annotation
    • https://kogababofaf.weebly.com/uploads/1/3/0/9/130969162/8643594d3193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_600baf2595bb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475570/normal_5fcf7f75b61b4.pdfIn PDF document text
    • https://dibigisilob.weebly.com/uploads/1/3/1/6/131607467/c24334fae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454287/normal_60083512dca6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485153/normal_6026efd316793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491437/normal_5fd6b1ca3ed32.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/4fd77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_6015a4475f070.pdfIn PDF document text
    • https://xupovefodifej.weebly.com/uploads/1/3/6/0/136053951/2aaaaa86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416331/normal_6002247e48781.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/kugelilizibuwum/malaria_treatment_guidelines_2016_india.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/puzzle_pieces_template_powerpoint_free.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/brave_browser_apk_mod.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_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 5472 bytes
SHA-256: 69ae237834519acfcc973893e2bdf742ec68cf2163d31dd4cb3c9fb0215223c8
font_01_sfnt_off000114e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E3 10796 bytes
SHA-256: 5b57ebcfd337243917050f049802dc694f3c670d15090bfd71f9530afde9e00f

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