Malicious PDF — malware analysis report

Static analysis result for SHA-256 21735211a1af581c…

MALICIOUS

PDF

80.6 KB Created: 2021-03-08 20:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4bf005aa4f828918124fb04959067a93 SHA-1: 49059162cdf5cab9a3878f025035900be43baf6f SHA-256: 21735211a1af581c8c16d304a60b2870204fd3b50f20a370804f9b05540ef258
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing and SEO spam. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple external URLs strongly suggest a malicious intent to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links indicate it's designed to lead users to malicious content, likely for phishing or scam purposes.

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 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.
  • 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/award?keyword=alimentacion+para+diabetes+tipo+1+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480736/normal_5fc8b40ad3ee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473637/normal_6041e75bda544.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462066/normal_600638f39d568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_60264cc391746.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378381/normal_60045a38dc08a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5ffb0a1b86090.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419826/normal_5ff88d32e8c10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_603edd51a43ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_6042cfc3b5c3e.pdfIn PDF document text
    • http://komakukamuduwi.iblogger.org/que_es_riesgo_biologico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_5fda6cf4d5f71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_8a7fb48533054a8ea9d6ba67c74898d0.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_26f13df841d94f57b85ed42d8bc61b38.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_5a54e4ede74743089adc29c5ffe500c8.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_6024e8d043f74e5ba353d09e844e4735.pdf?index=trueIn PDF document text
    • http://sojonowiwexus.rf.gd/nojobivepenalaje.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_f56aaae079dd496d805beff2e1c45059.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/kopotezivuwozofukoxevik.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/61414195833.pdfIn PDF document text
    • http://pazixurofuni.epizy.com/nikiwodu.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_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 5480 bytes
SHA-256: 2d7f802712381d5bcf018ea6b7873cd6e7f4b7133b6a7a6af5d74a301b71fd27
font_01_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 11740 bytes
SHA-256: 9fbe823f6d44a1a996cce41d024798574c1d0621543da2178cd644b57579f2eb

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