Malicious PDF — malware analysis report

Static analysis result for SHA-256 60da710c6779709f…

MALICIOUS

PDF

72.7 KB Created: 2021-02-10 18:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 889a6fd5eae32ccac84a7dd1cec43560 SHA-1: c3d0bdc526f3bffe2901886d520762da13bdde5d SHA-256: 60da710c6779709fc19d55edd2b3be4f2ce4489fe24d0ca5768f82a0fe8640b1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crophysi.ru/aws?utm_term=injury+report+vikings+bears In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_5fd2ef748ceb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494891/normal_5ff12e607147a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459939/normal_6005233b157a1.pdfIn PDF document text
    • https://dojosofezi.weebly.com/uploads/1/3/5/3/135390984/5221462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_600d30e938117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_602070cf00072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5fffdc784612e.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/pupixerukegare_tadamukipeb_duredabubun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374022/normal_5fcfb8aee3222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wonitijaxexilo.rf.gd/mlb_playoff_format_1990.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_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 5336 bytes
SHA-256: 2ac83ade98c87465aa66c015cbfe4c6f25b1446f509e662e88d5d2fcafb9e964
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 10692 bytes
SHA-256: 6b2164a568f0ce1910980c00bf4504d50f0f857a9495e27b33b7535ffb3af3f8

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