Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fceaefe591e600…

MALICIOUS

PDF

69.5 KB Created: 2020-12-18 17:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6eb1171aad5a5742cca4bd54f2284f55 SHA-1: 102a501bf8a78fd0de78a5c4b25a52aeac14d5bf SHA-256: 45fceaefe591e6002804f22c9e34e03d862fea75f8f9bc64379cb1ba24916294
174 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for a malicious redirector link and ClamAV detection. The ML classifier also assigned a very high probability of maliciousness. The embedded URL leads to a known malicious redirector, suggesting an attempt to phish or deliver a payload. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, indicating it might be a generated document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=think+with+socrates+paul+herrick+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5f8ea81b03d4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5f8f2db9f349d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_5f979c2d331b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5fa0c115cf2c8.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/tiniruru/bebepezewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae237c4-7dc5-4b9f-ab79-644931f07d4c/dimalus.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc659750a2757459b082a1f/t/5fca3d1abe6684539df54c4b/1607089437169/nugisek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867f482f-8d56-401c-abd5-1c2fac998d2d/maneras_de_amar_libro_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8f97d8-d516-4ff6-9db2-9e01134a0b16/jijiromotenitegigabubolag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e8ba3d-e4ba-42a1-a42a-edeba0884134/used_goose_decoy.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5608abe9b69395128be43/t/5fc8c0bb26a3037b43439bae/1606992059662/how_to_get_link_health_warframe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc4c5c9-c16d-4ef6-823a-ace81b0235de/mighty_mac_chipper_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/56092223634.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_off0000d125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD125 5348 bytes
SHA-256: c82c14ca1b7bc3d963a99203369a37876f7c61c22beea8b23e140bde8061e3ae
font_01_sfnt_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 11048 bytes
SHA-256: 8f8544599bf726f2a9842e8dea6f455ecd2fb77782e2e5aa2cc3587cc6343742

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