Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7eca63c72c77c4e…

MALICIOUS

PDF

72.3 KB Created: 2020-12-02 08:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3afe22c6baf618e713f419fdfbbc5671 SHA-1: 1784016d13264cb65d0bec198000a50d9df790d7 SHA-256: c7eca63c72c77c4e8c07734d1b38857a85399515b6c6d9e37c1be5f4348c3a12
222 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffine.ru/123?utm_term=wholesale+purchase+agreement+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4461748/normal_5fa6f21a70965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5f8a0e1431443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_5fa7d77f37a14.pdfIn PDF document text
    • https://joguxakiwemov.weebly.com/uploads/1/3/4/7/134707067/8973156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_5f9bcbe44d33e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5fbdc6d27dc23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474192/normal_5fae84a7e3834.pdfIn PDF document text
    • https://mopimigasu.weebly.com/uploads/1/3/4/8/134858917/bee05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_5f9ae82e65a75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_5fa5f234539b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_5f9ae95b50cbf.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/cd3f66b2-fa19-494a-bffc-19b8dce53d26/48634867310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d81608-ff4c-4165-abbc-116688e0e894/12258827098.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/megatumofenupesuxutebeniz.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/plain_dealer_obituaries_may_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5443c24b06a7eb31c46ee/t/5fc6d66c0623334b0c4ddac5/1606866540840/niwekax.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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 5580 bytes
SHA-256: e78e587b5f23bbd3e3381ec5aba7aeb4cfd648b18f84eff5c2b22dc2a13ff142
font_01_sfnt_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 11256 bytes
SHA-256: fef234ccf30487b37ca0d7855b783e931f2501f470bc75d6f2c180bbb7ef1f06

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