Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ab81550839cfb1…

MALICIOUS

PDF

74.4 KB Created: 2021-02-22 03:18:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d6db5e9cf996e59746cfeab4039dfc9d SHA-1: 24204cd9b03461ea8f828141569a1cceaab67ffb SHA-256: c4ab81550839cfb12217d7c66dc7bd090a17a6eaac4e9ff4f14bc54d446d0089
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL that mimics a search result, likely intended to trick the user into visiting a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high probability of malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

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
  • 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://jacksth.ru/strik?utm_term=how+to+choose+a+book+to+read+middle+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413223/normal_6022ca7261421.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486053/normal_5fff525cd6549.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5fcd5df87728a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452588/normal_5fca01e182725.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/gRZhi3N/98345442773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416929/normal_5fc7420a4a4a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_6015c1600cdaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456671/normal_5fdea104a445d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408176/normal_5fff2df36b891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_6032be0664061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ferurexage.epizy.com/newevusexizokozov.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/application_letter_for_secondary_teacher.pdfIn PDF document text
    • http://gekuvilis.epizy.com/5395972927.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/79053738448.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/children_s_dance_hd_video_songs.pdfIn PDF document text
    • http://fizanotafogibag.rf.gd/how_to_mix_limco_single_stage_paint.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_off0000e63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 5436 bytes
SHA-256: 1aa5477e897caab4d96815fc583de4c56b230e0c019e46351a5430e6a3d368bb
font_01_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 10476 bytes
SHA-256: c67b5483dc40a148bfa11d07c560110a976df9a39fe10f3e4161cfc1f35ab740

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