Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86c93d8cf0937ed…

MALICIOUS

PDF

77.5 KB Created: 2021-03-20 02:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c4b9053500321960aa988d86f0ac9b6f SHA-1: bc95f509182c59e7aadb9fc4ede4252261d93bd9 SHA-256: e86c93d8cf0937edbe15cac97901dc504b26997157a1b4a469c0ebd03de3edb4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, with one specifically identified as a malicious redirector. The heuristic firings indicate a high likelihood of malicious intent, including phishing and link farming. The presence of embedded URLs and the ML classifier's strong flagging further support this assessment. The document body, though heavily obfuscated, suggests a lure related to a 'Burkina Faso visa application form'.

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 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.
  • 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/123?utm_term=burkina+faso+visa+application+form+pdf In PDF document text
    • https://cdn.sqhk.co/zajujinul/ieugchf/10090237747.pdfIn PDF document text
    • https://mobafowowa.weebly.com/uploads/1/3/3/9/133997459/3134618.pdfIn PDF document text
    • https://bepogopinaw.weebly.com/uploads/1/3/4/7/134742936/1898592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500446/normal_5fcce12ca3c00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_6018848bc0fae.pdfIn PDF document text
    • https://cdn.sqhk.co/jakatote/cgPx2Fj/sulitur.pdfIn PDF document text
    • https://xadigepuve.weebly.com/uploads/1/3/1/4/131454317/5fcdfd93c46.pdfIn PDF document text
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/aa2830553b.pdfIn PDF document text
    • https://japosazononugad.weebly.com/uploads/1/3/4/5/134583509/bowomiwawonagok_judajudirujata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458848/normal_600c76b76973e.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/fboXiiX/11253700811.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/fvhiUge/hungry_shark_world_pc_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a9b0eaa65b234a8c838db66aa3709576.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/immunotherapy_in_breast_cancer.pdfIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_15d4504fbb534fec9d3f93c845671b23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/popirovawajademu.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/petuzibo.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/secure_vpn_pro_apk_1._0._0.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/lexique_securite_informatique.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_710489844ce646d5b7f6806b6dfc430b.pdf?index=trueIn 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_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 5472 bytes
SHA-256: bb7980ca468ae98c62c36a64c639325b363b0f8b15ac111fca8a726853e29dce
font_01_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 11220 bytes
SHA-256: 3aed892a8f588195c779b44493665ce688644104b83b89db487523d8e4b36db5

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