Malicious PDF — malware analysis report

Static analysis result for SHA-256 2433cfd273389b1f…

MALICIOUS

PDF

83.6 KB Created: 2020-12-21 02:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b5ae913e9626abd39e391533182bfa31 SHA-1: 779d1bf75d70a9f0cc96d79428efe86d5a50c041 SHA-256: 2433cfd273389b1f856ec0ca678c5889361570fb4ed0dace783d1d4aa364e176
222 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic findings indicate a PDF link farm and a critical ML classification for maliciousness. While no scripts were explicitly extracted, the nature of the links suggests an attempt to direct the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=distorted+thinking+worksheet In PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5fca027677916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450439/normal_5fa1ce11ee451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408881/normal_5fd998ca35aa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424696/normal_5fdd665a35298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5f8a29193c9bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5fd1f40c16e50.pdfIn PDF document text
    • https://vorarixumo.weebly.com/uploads/1/3/4/4/134490966/2573adc36c1b.pdfIn PDF document text
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/244495a7.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/jiguwuzobozobaz/aprender_ingles_para_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/tekigolatidukitaso.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/email_template_npmjs.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/mulching_sheet_suppliers_in_hyderabad.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/banshee_season_1_episode_5.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_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 5000 bytes
SHA-256: 604f2a3870979b8f6cce9bbf8c9fb6885245da85ecc1ea77d4ffe1e5102387f4
font_01_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 10184 bytes
SHA-256: e93968da82be05c559dc27e53385238a12ca4404873a7339565c024ff4f2b777

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