Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc05358a3a944ae5…

MALICIOUS

PDF

84.3 KB Created: 2021-01-01 17:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 879f010a9bea9957f2823341d1140c12 SHA-1: a7af9690737fb92e6ba848ae6dcb901b52d8f883 SHA-256: cc05358a3a944ae521881bcf11efa3baad80592d34d36235e5ddaa5a4d0a5ba9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a malicious link disguised as information about online schools, which is a common phishing lure. The embedded URL points to a known malicious redirector, and the ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded link suggest it's designed to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

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://cctraff.ru/strik?utm_term=occupational+therapy+assistant+online+schools+in+texas In PDF document text
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5fcb036bc02a0.pdfIn PDF document text
    • https://nukafubesogu.weebly.com/uploads/1/3/4/4/134463640/rawalo_siripigakodaga_jonav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_5fa4322bd54d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422390/normal_5fb2857e58627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5fa9b8452a3ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454546/normal_5fb9782662f39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f9f9feda14b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485153/normal_5fb8388be77c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_5f991e2a35e35.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/nodetuxapabara/tupufupupozaxunarem.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/math_u_see_level_1.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/22505064990.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/abiotic_factors_of_the_taiga_biome.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/blank_instagram_template_psd.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_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 5216 bytes
SHA-256: 0b1491f56f3843063580981a8bbe79a704547a0a6819ddc4c0b751329249a580
font_01_sfnt_off00011f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7A 10728 bytes
SHA-256: a64b79080c726220e2fa5f600b3fbc3c056745bb86004098aad353ba13a69d4c

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