Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bf0cd09a3c5716…

MALICIOUS

PDF

66.2 KB Created: 2020-11-19 16:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d6091735b65600748e57cbf32ad6d68 SHA-1: 12d1ba24973c7654a291bb5923139baa22e9f2a8 SHA-256: e1bf0cd09a3c5716418019462af8af503f4743c3b8cdbac46c810d3461f90304
214 Risk Score

Malware Insights

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

This PDF document is identified as malicious, likely a phishing or redirection campaign. It contains a large number of embedded URLs, many pointing to link farms and redirector infrastructure, designed to obscure the final malicious destination. The document's content, though heavily obfuscated, appears to be a lure related to educational materials, specifically 'algebra fun sheets answer key'. The presence of numerous external links and the ML classifier's high confidence score indicate a deliberate attempt to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=algebra+fun+sheets+answer+key+adding+and+subtracting+polynomials
    • https://jadigitunuw.weebly.com/uploads/1/3/4/6/134672933/wofakezesizuta-tilimefuk-tixetasa-jepoluxixipa.pdf
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5f98cd8ee0376.pdf
    • https://vobobesi.weebly.com/uploads/1/3/4/7/134702984/8502806.pdf
    • https://cdn-cms.f-static.net/uploads/4373755/normal_5fa945c5c9875.pdf
    • https://taxufizewafodo.weebly.com/uploads/1/3/4/4/134477277/relexodorewi-dalokam.pdf
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f894ef9a7bc4.pdf
    • https://xinufagepowe.weebly.com/uploads/1/3/4/4/134437511/musokagawe.pdf
    • https://cdn-cms.f-static.net/uploads/4450870/normal_5fb625885b1d5.pdf
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5f9e47a625a22.pdf
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/nomusilibefonag.pdf
    • https://miragitoketulo.weebly.com/uploads/1/3/3/9/133997248/bulig-medazuxiwuje.pdf
    • https://lonopowixeza.weebly.com/uploads/1/3/4/6/134620564/772e9ba9e67428.pdf
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f99358073b74.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/palaj_xofepevez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8e8c2321-e3cc-43f2-a254-05e959dc1ede/62803626568.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c396.bin
d2b885c2da60d5bc09b8f1415d7ebf2f24e4d4b41ca8fcc61fde9787b19202eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC396 5956 bytes
font_01_sfnt_off0000d7cb.bin
92475ee0589c6a5b223bd27d759f6f003a22bc5172e71daa8204973c16b6f5c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 10644 bytes

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