Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26bde61b1412ac9…

MALICIOUS

PDF

39.1 KB Created: 2020-06-21 21:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e10aaa102ce56fd9c78442eba3a6e564 SHA-1: 73f1771eb1483045a2298515805dbd75265a9269 SHA-256: f26bde61b1412ac9fcbc8f26cd928d0e46eae849fcb8543dbe5c415687f52c1f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be part of a link farm designed for SEO manipulation. The primary heuristic firing, PDF_SEO_LINK_FARM, indicates a high volume of generated links, suggesting a malicious intent to drive traffic or host malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://coastalchurchmaine.com/uploads/1/3/0/7/130775969/130775969.html#digital+panel+meter+pdf
    • http://wishfulthinkin.net/uploads/1/3/1/4/131406356/pakinolide-xaxijigo-lemolez.pdf
    • http://laskey-science-6th-per-online.info/uploads/1/3/0/5/130589214/kevumora-revulugepo-gigexakefarame-tizowonulila.pdf
    • http://beprosafe.net/uploads/1/3/0/4/130489175/roxiw.pdf
    • http://columneducation.com/uploads/1/3/0/9/130969430/6cf25.pdf
    • http://globalnationalfunding.com/uploads/1/3/0/9/130969411/2440354.pdf
    • http://sjrpsychiatry.com/uploads/1/3/0/8/130874260/e0f22be14.pdf
    • http://yoniio.com/uploads/1/3/2/6/132683088/niwasafudakezuz.pdf
    • http://creativeconcreterentalandsupply.com/uploads/1/3/1/0/131070010/2856792.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058f6.bin
2a077f3321a855541ff55df536f00dc57d640056fd86edc1e3991e83913c0570		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F6 4860 bytes
font_01_sfnt_off0000695d.bin
83802dd246dcd736c9846b571cce304e41dedcb723b03a40a1924f433fd935a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695D 11476 bytes

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