Malicious PDF — malware analysis report

Static analysis result for SHA-256 8795ec7f4c019d39…

MALICIOUS

PDF

61.0 KB Created: 2020-12-23 00:35:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 35b6a478067f2200b032dd85f45d6163 SHA-1: 0bac1ef1350e1cd15b520c9c8bd4a00f306ffab0 SHA-256: 8795ec7f4c019d3910f8778792d1dd7744cf129210138a802fc6eeabb5e48fdb
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of a link farm indicate a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/aws?utm_term=arulnithi+all+songs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_5fdc3d5dc942f.pdfIn PDF document text
    • https://daluwora.weebly.com/uploads/1/3/4/3/134319963/2207681.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374196/normal_5fde8acb53793.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/57b6b5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_5fdb57155feb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5fcf73518b563.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/5fcf7f61d5d65324e4ae2fc8/t/5fd6a5ebacac596b0cc5b036/1607902700405/kisugopuzevaju.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd09eaec0a1d2b4e576865/1606224363165/8934461373.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc30874df132613bbcb9d36/t/5fcdcc8ec00f007cea0914dd/1607322767001/garenafaxadabe.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/revista_national_geographic_brasil.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde95ce5b7bc966055f9f1c/t/5fdeccd7f11f517dbbce3a9f/1608436952325/masoragasagobanavisukake.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/39072818662.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/bruchrechnen_aufgaben.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/factorization_worksheets_grade_7.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_off0000b3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AB 4936 bytes
SHA-256: d6d7f623d6e2e819530eeccb1b82d89dde0d14430923033d975a0980763f22c8
font_01_sfnt_off0000c46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46B 10328 bytes
SHA-256: 6aa4f26c11e873e758489c9475a9c45401642202f60ddf125b5fc68f2bb84c23

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