Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cfae96c9cc2c8a…

MALICIOUS

PDF

70.1 KB Created: 2020-12-16 08:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df1ce0d1ba63f737b74740bc9fe1f88c SHA-1: 1b5e06cd0f4b76b34a11abe1270844e66c4f95f3 SHA-256: 57cfae96c9cc2c8a3898c6f4c6cefa0d9de56a23e5da15810ee44a56736a68bc
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, disguised as a 'compound interest worksheet answers'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of a malicious URL within the document body is a primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/strik?utm_term=compound+interest+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/62cf232c-3a3a-4da8-a954-ef478da119db/pioneer_sc_75_manual.pdf
    • https://s3.amazonaws.com/pulavokaxe/viwisivoradatumasasug.pdf
    • https://s3.amazonaws.com/liguwubore/letafuxiziniruwakuf.pdf
    • https://s3.amazonaws.com/bezutu/program_anti_plagiarism_free.pdf
    • https://s3.amazonaws.com/vedexajawo/menisixevazuxovilu.pdf
    • https://uploads.strikinglycdn.com/files/b4ece824-440a-4132-b712-e7caeb42f308/bunting_template_psd.pdf
    • https://s3.amazonaws.com/wexoteluwag/pit_boss_700fb_user_manual.pdf
    • https://s3.amazonaws.com/kovilowab/dnd_5e_yuan_ti_malison.pdf
    • https://s3.amazonaws.com/luborinizu/16882334286.pdf
    • https://s3.amazonaws.com/wiremeresegikon/best_book_creator_for_android.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf35.bin
6f188140e4a25a9313e8f97fa58cecf41a61104355bcfcd7921537130ab5f70f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF35 5228 bytes
font_01_sfnt_off0000d0db.bin
ff886c9806d5765f4cfa751295932243be76758d67545c7aeb5dddf93ad96273		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DB 10980 bytes
font_02_sfnt_off0000f66a.bin
511e71bca8d2c1f4264f029d607da259a2c56c99fcf310a9c4ef0146ec8eb1b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 16212 bytes

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