Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c80e9a280d80ec7…

MALICIOUS

PDF

38.9 KB Created: 2020-06-06 12:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 4ded1d0f83cc41407da4cb3892198ee6 SHA-1: 9e50e88b686f24464dd9b2097e6e4459ea267701 SHA-256: 8c80e9a280d80ec750fc868e56150758d69f386c2554841fc0317c2d9d7ed967
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The document body contains a mix of seemingly benign text and embedded URLs, reinforcing the link farm nature of the document. No scripts were extracted, and the primary malicious activity appears to be the aggregation and presentation of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://projecteagleatl.com/uploads/1/3/0/7/130776680/130776680.html#libro+matematicas+academicas+3o+eso PDF link annotation
    • http://teambyrne.net/uploads/1/3/0/5/130551621/fuvekalolivoji_wikilut_bopovajizaz.pdfIn PDF document text
    • http://jemkik.net/uploads/1/3/0/2/130288565/4a37c.pdfIn PDF document text
    • http://jamiegellingsmediablog.com/uploads/1/3/0/6/130604767/c70da92.pdfIn PDF document text
    • http://onsightcoffee.com/uploads/1/3/0/5/130546804/5327952.pdfIn PDF document text
    • http://brooksranchinvestments.net/uploads/1/3/0/2/130274330/def303fdbf8f271.pdfIn PDF document text
    • http://rocksinthebox.com/uploads/1/3/1/1/131164393/3122678.pdfIn PDF document text
    • http://aspenlifesettlement.com/uploads/1/3/0/2/130289782/bawupikuzuf.pdfIn PDF document text
    • http://otcjunior.com/uploads/1/3/0/6/130621351/caf6dcdb1d.pdfIn PDF document text
    • http://projecteagleatl.com/uploads/1/3/0/7/130776680/terms.htmlIn PDF document text
    • http://projecteagleatl.com/uploads/1/3/0/7/130776680/dmca.htmlIn PDF document text
    • http://projecteagleatl.com/uploads/1/3/0/7/130776680/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://najizubomugu.files.wordpress.com/2020/06/wuxep.pdfIn PDF document text
    • https://najileriwis.files.wordpress.com/2020/06/kafisaxokanejaw.pdfIn PDF document text
    • https://dojujakukaj.files.wordpress.com/2020/06/19606257541.pdfIn PDF document text
    • https://musepig.files.wordpress.com/2020/06/gedijupedivimudaxiviju.pdfIn PDF document text
    • https://polobepokug.files.wordpress.com/2020/06/22177933253.pdfIn PDF document text
    • http://vurokufi.myhostpoint.ch/uploads/1/3/1/4/131483076/7788af.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1A 3000 bytes
SHA-256: b76734a1e6b8b024f52e93d62dc7ce74ba8334128957a668090ec25ef9817585
font_01_sfnt_off000068cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68CC 11192 bytes
SHA-256: b5668379cf6fafa31ef026302708fedcea80bac3e84caba2a2e82ce3976a7aba

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