Malicious PDF — malware analysis report

Static analysis result for SHA-256 4514f55bc71401d0…

MALICIOUS

PDF

66.9 KB Created: 2020-12-24 11:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f575f2f328df51f68611818581456f97 SHA-1: 3e8880564c02c55ef679330bb86448f5129149e3 SHA-256: 4514f55bc71401d0551a9fda041d8a16f9cc42efa496fe8d2ef42a8b7366b7da
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector, suggesting a phishing or malware distribution attempt. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the nature of the links and the PDF structure strongly suggest an attempt to redirect users to malicious content.

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/123?utm_term=excel+tax+spreadsheet+template+australia In PDF document text
    • https://static.s123-cdn-static.com/uploads/4410731/normal_5fcab73df03e4.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/f2d1a4da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_5f997c21b6eb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f871a5624e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445739/normal_5fb28c0dce2d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5faa632bbb981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5fa7439e721c3.pdfIn PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/9f655d0f7ca0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_5fa9ad4518d3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f9ccd7eb93d3.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/mijedusovineti/20641950854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbae2cba-7786-437a-93f2-819882ba2978/cat_evolution_clicker_game.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_off0000c80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80E 5340 bytes
SHA-256: 64bee146330e58f56bd388fe90ea272bf0ba68cac1c5e788f36e94b9fe4744d7
font_01_sfnt_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 11048 bytes
SHA-256: be7f6eef5dd65f2ca0b572a9eae98f0376b8d557916b997a7cfd662fdb850834

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