Malicious PDF — malware analysis report

Static analysis result for SHA-256 794efe35e28d4666…

MALICIOUS

PDF

85.6 KB Created: 2020-12-01 18:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1a968bc5e2382d411eca719d67ed0bef SHA-1: da3dd468a8561a8cdcfdfa4e627d4fa804ea8886 SHA-256: 794efe35e28d46661ecd5246855efe17fa6426bcacc3e9c7efa387f108164ce7
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be directing users to potentially malicious or phishing websites, as evidenced by the suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/wb?keyword=bilinear%20form%20dot%20product In PDF document text
    • https://nimopiwezu.weebly.com/uploads/1/3/4/7/134700470/xesupemekelufak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_5fc1f77c26284.pdfIn PDF document text
    • https://jejabulalirolu.weebly.com/uploads/1/3/4/4/134464322/f6f3e059f9.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/mewejitesejafan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_5f9a3ce087408.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/5069218.pdfIn PDF document text
    • https://ponixojezunuto.weebly.com/uploads/1/3/0/9/130969897/bunabozojisedimilak.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/9b53ec72f.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/5fc1559bc6d9645836252c59/t/5fc40ca7e18c5c478e79b1a1/1606683818459/what_change_in_membrane_potential_triggers_an_action_potential.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/lowelilexinekinax.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4dc15147b1480429917d/1606372804657/mesaxaxazaget.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b63bab79f442f228a4c9/t/5fc15d659d79364840c08b35/1606507877623/47313380064.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c87788c99b6d37a67a80/t/5fc0e40ee6d49a06bbb2db9b/1606476815412/un_beso_y_una_flor_significado.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 5172 bytes
SHA-256: 0be9c987a7c8e43b2ee2721bd91739b7c5f2f0783ab362049601f339251cbdaa
font_01_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 12792 bytes
SHA-256: 43bfadf5ae214e54b9325ae7437a07e12c965ff58192405716618bdf091bc881
font_02_sfnt_off000130e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E2 16964 bytes
SHA-256: 3bd15aa5048b57fe91a13959b3f5145e98269d4211194a09cdf8a0d2f4df7c61

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