Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e521a22a942af5…

MALICIOUS

PDF

78.0 KB Created: 2020-11-16 12:26:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ea921ce0416b9377724ee630cf66bac0 SHA-1: 024b41af709414429d32044262de8812d4e22c53 SHA-256: 57e521a22a942af523a323137b2e64ec427217290fe2344c76f520524b7a7520
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ggtraff.ru/strik?utm_term=problemas+de+g%25C3%25AAnero+feminismo+e+subvers%25C3%25A3o+da+identidade`. It also exhibits a PDF link farm behavior with 24 external PDF links, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=problemas+de+g%25C3%25AAnero+feminismo+e+subvers%25C3%25A3o+da+identidade In PDF document text
    • https://cdn-cms.f-static.net/uploads/4462096/normal_5fa1900792849.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/7744584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5f90f9f61abdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388424/normal_5f99f98ad8bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f9ad535730cf.pdfIn PDF document text
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/vojawaroju-duripovubuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f99af035de8c.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/84b76759-64fc-49ea-ac21-763da2f2b20a/sodikomesisadarab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/773821b1-9a83-47fd-9f55-f825ff7cdadf/encyclopedia_magica_volume_4.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/limagaresakikexetavuzog.pdfIn PDF document text
    • https://s3.amazonaws.com/tekujel/kuvirumijun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dbf60ba-463b-4e80-b463-ec1014c22d49/see_it_bigger_daily_planner_2020.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_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 5896 bytes
SHA-256: 01fd6da5290e8e09ed9f2c5769d0290c4b07385392486971d13e3e779478a0bf
font_01_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 13200 bytes
SHA-256: 25dc4f7f431352b46d33b2442cf86908b75e4ef2f15eaeca3ee92ce0a7ac1555

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