Malicious PDF — malware analysis report

Static analysis result for SHA-256 be952d7c1f1d3607…

MALICIOUS

PDF

78.4 KB Created: 2020-12-17 02:39:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a574bc553eb40a4e8d318ccd3497af45 SHA-1: 92134fe4637873a84465950e4c45b39b5af92715 SHA-256: be952d7c1f1d3607e3a9441c63300d6dc304a03c1901262f3fd8e66992e68b9a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a firmware update notification. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of a malicious URL suggests the document is designed to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://ggtraff.ru/123?utm_term=wise+tiger+router+firmware+update In PDF document text
    • https://static.s123-cdn-static.com/uploads/4444636/normal_5fc7b6547007d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_5faedea2b532c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416932/normal_5fa7094a8097b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449012/normal_5fd1bac1f2e36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_5fa7e76b1f0ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f91306b46af4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad66a59-2238-43a9-b622-0d5812d4089e/71148458794.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e698cd1e280355d44756/t/5fd1748223f2866aa37ea371/1607562370929/name_that_song_app_game.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/senorita_piano_sheet_letters.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc529e012facd59cec8ad00/t/5fc5f49e18e72e5fdba4b3c7/1606808737547/boston_half_marathon_registration.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d031e2fce462bcad9e70/t/5fcd72eb2bc7884852ca107e/1607299829894/survival_on_raft_ocean.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/vugikof.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4f2fe6d49a06bb8861cc/1606373168370/cold_steel_trailmaster_carbon_v.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_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 5432 bytes
SHA-256: 5e262f2468d7cc86e752cc54ed2b5e95fc761ce7684c7642ad9f7c681ee69821
font_01_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 11108 bytes
SHA-256: 9d91c730484f49f21f1c4eab4b536948ea8ed73cb2ffc688f68359267718d4be

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