Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1736900121fb033…

MALICIOUS

PDF

67.3 KB Created: 2021-02-11 07:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0aea8694dbc502efd7ce93f54c7e1945 SHA-1: 9ed986eb6a6437703f8d01ba7e3bd5c2fa47ce3b SHA-256: b1736900121fb033b0f96f71c30f76582e27cee7c8203f5caa0626280420b1ff
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wb?keyword=capitalization%20and%20punctuation%20worksheets%20grade%201'. This URL is likely used to lure victims into a phishing or malware download site. The ML classifier and ClamAV detection further support the malicious nature of this PDF, indicating it's a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/wb?keyword=capitalization%20and%20punctuation%20worksheets%20grade%201 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4411503/normal_5fcb47745a563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445343/normal_6001653d33cbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446263/normal_5fc93f5164b77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_6014214261ea5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5ff2c569de1dd.pdfIn PDF document text
    • http://kakerusejom.iblogger.org/74423938310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392452/normal_60220dbb992c8.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/wisuw/65322785751.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/sodup.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/classifying_triangles_worksheet_common_core.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/enzyme_structure_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/property_animation_in_android_example.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/nojorubilapekijot.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/74893115456.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/26454682876.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/fofaxekonike.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/29624833809.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_off0000c903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC903 5500 bytes
SHA-256: dde4937291408ebce49821edce827a50ff4d3143bfc9b2fb772024a8e01d3ea4
font_01_sfnt_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 10496 bytes
SHA-256: eba7f28655f8b9065f0e30299a522e7d9c24c710ca4b2444b77ac3f89ca7d86a

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