Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d1cd1adf9cc20d…

MALICIOUS

PDF

34.5 KB Created: 2020-04-11 08:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8e1148fc18f63ce95af75d8687de2e37 SHA-1: f7c3bb2736641288ee9c3aaf468f40772396e6e1 SHA-256: 72d1cd1adf9cc20daa2af16a5f6e4b7753b1886008f3ae543728ab18062bdb79
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to seemingly unrelated PDF files hosted on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of numerous suspicious URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cww60.bpmtc.com/uploads/1/3/0/6/130639540/130639540.html#club+car+carryall+turf+2+service+manual
    • http://amplifier4jc.com/uploads/1/3/0/6/130620327/xixosa-jekowaxajoz-bitasi.pdf
    • http://meechieblessboostcreditllc.com/uploads/1/3/0/6/130620176/998807.pdf
    • http://sicklervilletreeservice.com/uploads/1/3/0/8/130813646/gujabivan.pdf
    • http://dkranch.org/uploads/1/3/0/4/130476288/9440851.pdf
    • http://seawbrasil.com/uploads/1/3/1/4/131455680/xudofidexivo.pdf
    • http://billlauto.com/uploads/1/3/0/6/130621619/wewerarudenu.pdf
    • http://hotyogaptos.com/uploads/1/3/0/4/130477633/namogu.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ddd.bin
6eb46293d46e5d2dff6910dbafa3256f22a9639eb55a5987e474e134f7d51a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDD 7924 bytes

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