Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8899641a68fbe4b…

MALICIOUS

PDF

70.8 KB Created: 2020-12-08 04:11:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 240252c2a4e3fd69972b3e1d46876f5d SHA-1: dddb5ed3ec3bcde42c6684f00009f5e826b7ab1e SHA-256: d8899641a68fbe4badcdd23b3af13d6c6085e423f68894aaca93d182597e10ce
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://ggtraff.ru/123?utm_term=halloween+costumes+for+math+teachers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_5f94417e416c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f8a8b91ca4b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_5fa7b4a6d2299.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/xafaxotaful/37302555887.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/84863670732.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/45628661938.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/28372409478.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc302ce16f6d44b07cc72db/t/5fc9780d8775ce141d7784db/1607038990338/17921000259.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/jitotadisawevaruwotegikoj.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/pizizojonu.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/58609857146.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/29182863957.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF3 5172 bytes
SHA-256: da25b5b483abba031fe351666c31bdc067ff0c7733dccc79250e43ad37e5204a
font_01_sfnt_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 2528 bytes
SHA-256: fa00ca2efb3740422adce526fcbaa5037a21e39b9482affa9e7d95016e3f9ad0
font_02_sfnt_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 11408 bytes
SHA-256: ed05c48e35a39353904c535839d25a44c0ba946c0852721852916dc2e32d8e79

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