Malicious PDF — malware analysis report

Static analysis result for SHA-256 b309b672e8ff701b…

MALICIOUS

PDF

68.2 KB Created: 2020-12-16 16:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa82ed592ab67345e8d9f5d92fb5a7b0 SHA-1: 535bf9998cbf07becd3a1df63cbe62cf275088d8 SHA-256: b309b672e8ff701baf20aaa2c98a2f24e7eba15b9b0d874a36947165d7888e9a
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, contains text that appears to be a lure related to a school website, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffnew.ru/123?utm_term=ridgway+high+school+website
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/7342999.pdf
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5fb88906c1edc.pdf
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5faa3de41684d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fasanag/zewoxopulitorizu.pdf
    • https://s3.amazonaws.com/zamuriza/rituvisaxo.pdf
    • https://s3.amazonaws.com/mixanaz/99077293695.pdf
    • https://s3.amazonaws.com/vufupu/xawexinomisawitozeg.pdf
    • https://s3.amazonaws.com/xezonijida/11090269581.pdf
    • https://static1.squarespace.com/static/5fc2902d1452f90b7fefcf7d/t/5fc3e7c27acac6192a38c491/1606674372135/kevumigilos.pdf
    • https://s3.amazonaws.com/susopuzupure/almanack_book.pdf
    • https://static1.squarespace.com/static/5fc345e6affbf90a66f9bf12/t/5fccc4d7920f47545b916a6f/1607255260226/44880783683.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0e.bin
b14631dda8c90dd10bd4aab8be64d7a0071846efe1eae3518fc6112a19edb102		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0E 5448 bytes
font_01_sfnt_off0000dfb8.bin
de2aeae88c672cc964c19c2e0d2ce386cf4ae90e846983d1c8f016056a0f49c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB8 10820 bytes

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