Malicious PDF — malware analysis report

Static analysis result for SHA-256 3421900b0309d619…

MALICIOUS

PDF

72.5 KB Created: 2020-12-01 10:10:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b5d4b38831012be6b716923f78f23667 SHA-1: 1f17482aa0e218a2a824d08929f64c0a752a6210 SHA-256: 3421900b0309d6193256eb2d113c250b4be8394098c7807973ccf261036e845e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for linking to known malicious redirector infrastructure. Another critical heuristic indicates a PDF link farm, suggesting SEO poisoning or a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffmen.ru/123?utm_term=coney+island+baby+lyrics+genius In PDF document text
    • https://wuwejinetuna.weebly.com/uploads/1/3/2/6/132681176/34b63b4.pdfIn PDF document text
    • https://sijanobodebalu.weebly.com/uploads/1/3/4/6/134639398/zofesorolufolor-dajove-besefuwefarafov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0fa208ef7301f8b1117d5/t/5fc5a36f9ee0f32b87161fed/1606787951861/kamiak_show_band_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b544c89e1c4b8fbd6471/t/5fc514713f75b1664374fd7f/1606751345276/tarot_for_beginners.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d4c78139af037644e8c4/t/5fc1259c61e25426e1612f11/1606493596751/35245213833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a80955e-4075-496c-a9a2-34d1674e7e87/motorola_apx_8500.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/mikilitopagopavuvafufav.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1896f978787041ccc312/1606228122344/firanugotinopufekelajazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11730e9a-a92f-431d-91bb-ffbeb759290d/98379840997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c459827d-41b4-4cdf-8eb7-a74bb71dae77/29223048765.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2c6032e34347c70505203/t/5fc5ad5ef3de5e49b529787f/1606790499411/62178121396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af4731c-8818-4acb-9bf3-10b202c99c0f/camp_walter_johnson_denton_nc_number.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd06b273299f0c543b2623/1606223539157/in_nothing_gold_can_stay_which_allusion_would_be_best_understood_by_an_ancient_greek.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_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 5256 bytes
SHA-256: 14b0e012e9caa993de940d8f472b8869e4bce8b09c7684aa2209d366ec9dec4e
font_01_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 11204 bytes
SHA-256: 5e0cf6a45ef91ef5bcac17d033a01596ae9f9500bd21b66b8f08d72016599122

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