Malicious PDF — malware analysis report

Static analysis result for SHA-256 effbafe32231b3e2…

MALICIOUS

PDF

73.0 KB Created: 2021-01-05 01:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cff92a9804ccfaedf6ffb47fdc420290 SHA-1: 20406cfdc5eb5343189a33d647e1509d8adef427 SHA-256: effbafe32231b3e29b761585ae9f5043f5471f572af6e3cabf81c984639c76bd
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, indicating a phishing attempt disguised as 'birthday wishes'. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded malicious URL are sufficient indicators of a phishing lure designed to redirect users to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=birthday+wishes+pic In PDF document text
    • https://cdn.sqhk.co/nerutamar/ehhjfih/sowemupufuvusujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_5f9c33fc7e790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383798/normal_5f8c9331afa46.pdfIn PDF document text
    • https://cdn.sqhk.co/pofilese/ggLtngg/music_and_arts_cary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427519/normal_5fcb18fe98491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5fe4f5981b85e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394073/normal_5ff024ef052ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475985/normal_5fd6242845055.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/juwofuxufijup/sibasobesipelegotujozar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68663c59-cf90-44f9-b4ef-ae495e32b60a/tonave.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_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 5372 bytes
SHA-256: 2ba6a69b967747107b0174ad11bd3641cb0e87859e134bb8ef60cc34d67ff688
font_01_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 10716 bytes
SHA-256: 437120d8d53dcc6560405ac2ae8cfb118ce10ee906466456c01ce9ca8af2118f