Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c0ca65acd0261c…

MALICIOUS

PDF

75.9 KB Created: 2021-01-02 10:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c9be90a50833d7fbdb2833008daaf0b9 SHA-1: d20011c712bdd220bb5fca0c8eac4246330f8d3c SHA-256: f1c0ca65acd0261c1a1f868368ba8be6c1e027b345846907023de088eeabc943
174 Risk Score

Malware Insights

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

The PDF contains a malformed stream and a critical heuristic firing for a malicious redirector link, indicating it's designed to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to serve a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=native+american+paintings+for+sale In PDF document text
    • https://guwepejesa.weebly.com/uploads/1/3/2/8/132814432/noliboti_faxir_zazarasuwado.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/Yomhahj/kojagugobud.pdfIn PDF document text
    • https://xibuderopugef.weebly.com/uploads/1/3/4/0/134042602/tulafidimegabiw.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/hShf9AW/calcular_iva_ecuador.pdfIn PDF document text
    • https://guratebiliwabop.weebly.com/uploads/1/3/2/6/132682790/bolov.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuzini/eja6uij/60280001374.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/felasorarabipis/vetozanowaduvada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b0736e-7ef3-47b5-a7f5-7cb72e573b5a/descargar_murderer_online_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/d_nealian_cursive_handwriting_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/drink_glassware_guide.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_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 5364 bytes
SHA-256: 069137dca10d10de56109bc456788f16023b1227779e5763d57437210345448d
font_01_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 10620 bytes
SHA-256: 836028d50ef8ba66b9ce81d8ac43925eb41955db547e13830f3fde0dce151d77

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