Malicious PDF — malware analysis report

Static analysis result for SHA-256 456144fae509f396…

MALICIOUS

PDF

69.3 KB Created: 2021-02-22 15:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5dec5464c8da3cb2b2bbccc6a624f514 SHA-1: 7f376fc34f6fb8253d6a633abac5d6ab4ef2b8e6 SHA-256: 456144fae509f3968acf8e7a1956a326b40b9f5c82fbca06fa985ad30d567ee4
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to educational materials ('Surface area and volume class 9 test paper pdf'). The presence of multiple external PDF links, including one pointing to a potentially malicious domain, indicates an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=surface+area+and+volume+class+9+test+paper+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454170/normal_5fe1246e91647.pdfIn PDF document text
    • http://bit7.top/33565990041w5u5g.pdfIn PDF document text
    • http://creampiepow.club/sasazoferemoponzxyxh.pdfIn PDF document text
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/rujibet.pdfIn PDF document text
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/lalaguxedavaka.pdfIn PDF document text
    • https://cdn.sqhk.co/konumapedowe/rz8gdhj/birddogs_shorts_commercial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499979/normal_5ff589fb62ad3.pdfIn PDF document text
    • http://souve.me/humpty_dumpty_magazine_submission_guidelinesvlqdh.pdfIn PDF document text
    • http://knitfqph.site/42524630600cg6p1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_60253799b08fd.pdfIn PDF document text
    • https://wexejejide.weebly.com/uploads/1/3/3/9/133986252/2009639.pdfIn PDF document text
    • https://cdn.sqhk.co/xupixawina/gjThdjh/line_official_account_change_country.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/dukexajuj/pukegavamefimefuneko.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/8761857649.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/appium_android_chrome_capabilities.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/mailchimp_template_language_example.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/91451734807.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_off0000cf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF31 5620 bytes
SHA-256: 198f5a3a04f1c2f3344bc8c0819c7e56be0be52fd79e63e50c3c7e0e8f009afa
font_01_sfnt_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 10532 bytes
SHA-256: 1feeed05d191f109a067d490c69ad6191f786cac243ff3bea236f713222ac88c

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