Malicious PDF — malware analysis report

Static analysis result for SHA-256 640e5d5f98e78f0a…

MALICIOUS

PDF

38.7 KB Created: 2020-06-23 12:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7180d65ae213f3cef9989467740d3729 SHA-1: 2adc0f817cdf65490b6f35db7cb8886fc538ab7c SHA-256: 640e5d5f98e78f0a6f6e450d392db5b469d76acbf6fa1c152da8aad5d4b860d5
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to host further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to potentially harmful sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://o6wvhz.salon225.com/uploads/1/3/1/3/131383650/131383650.html#place+value+year+6+worksheets
    • http://nowiseecampaign.com/uploads/1/3/0/5/130589191/3e36756ba6c32.pdf
    • http://baijialezenyangying.br3h.com/uploads/1/3/1/4/131453720/navaxuj.pdf
    • http://waideirrigation.com/uploads/1/3/0/8/130874042/joliloji.pdf
    • http://endoflifecompanions.org/uploads/1/3/1/6/131607103/tubonowofoxa-niwusotoj.pdf
    • http://starspangledbabe.com/uploads/1/3/0/8/130813601/8867b9bf7.pdf
    • http://backyardbeerworks.com/uploads/1/3/1/3/131383456/fubopajoba-mivepux-kudosatifireg.pdf
    • http://teachingachildtoread.com/uploads/1/3/1/0/131070314/a6ec2a1bf76.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00005b67.bin
a077553269ecc4dde82f46597fe83de04ea272a0d30f4f6a965541976528fb39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B67 5088 bytes
font_01_sfnt_off00006ce0.bin
276a31f26e8c0def21a627cfd6161993de5db32dffa91f14a2dfe765a767642b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE0 10032 bytes

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