Malicious PDF — malware analysis report

Static analysis result for SHA-256 517fd43958512f5f…

MALICIOUS

PDF

67.5 KB Created: 2020-12-21 06:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1131e49cbb138eadf75e18aee5a31abb SHA-1: 1ef7987546e4b485000d179be2291241d93c8a97 SHA-256: 517fd43958512f5fcf1be36e296cbf86f02a45985e1d009e95a6c4203fedda03
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL that directs users to a suspicious domain, likely for phishing or to download further malicious content. The document body, though heavily obfuscated, contains text that appears to be a lure related to a 'health update'. No scripts were extracted, but the presence of an external URI and the overall detection profile suggest a phishing or malware delivery attempt.

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?utm_term=alexx+blanks+health+update+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461773/normal_5fa79beed886a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444357/normal_5fca1897f3b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443342/normal_5fa14ccd85ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5faa2cc9738a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5fa823c70278a.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/vuzufexarevima/68249911602.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/the_turn_of_the_screw_by_henry_james.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdeb274fbf4ee0481da8a5f/t/5fdf8dbb5809ae343413236a/1608486332203/discus_fish_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/snacks_recipes_in_tamil.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe4a1ff81c9a2a0c6f61ec/1606306335520/the_princess_bride_by_s_morgenstern_unabridged.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/robin_l_donald_do.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/learning_spanish_language_free_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2f3e1bf71053ccb1d777a/t/5fc7604b788a962b7c2e562c/1606901835359/gunnera_plant_uk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e8e5bf71053ccb103ceb/t/5fcc615a33187724c4e8a553/1607229789189/2980611436.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/75833207313.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_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 5484 bytes
SHA-256: d53a45379b91e9f74759d8326f32145e8c7ccac0be9c6a652aaee3d070510c92
font_01_sfnt_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 10088 bytes
SHA-256: d136c8b82b475833872a32bf8aa8db53ed48d8947524a5a91014bfeadcc56cd3

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